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ErrorCheck.jrag

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    ACM-Reference-Format.bst 81.61 KiB
    %%% -*-BibTeX-*-
    %%% ====================================================================
    %%%  @BibTeX-style-file{
    %%%     author          = "Nelson H. F. Beebe, Boris Veytsman and Gerald Murray",
    %%%     version         = "2.1",
    %%%     date            = "14 June 2017",
    %%%     filename        = "ACM-Reference-Format.bst",
    %%%     email           = "borisv@lk.net, boris@varphi.com",
    %%%     codetable       = "ISO/ASCII",
    %%%     keywords        = "ACM Transactions bibliography style; BibTeX",
    %%%     license         = "public domain",
    %%%     supported       = "yes",
    %%%     abstract        = "",
    %%%  }
    %%% ====================================================================
    
    %%% Revision history:  see source in git
    
    ENTRY
      { address
        advisor
        archiveprefix
        author
        booktitle
        chapter
        city
        date
        edition
        editor
        eprint
        eprinttype
        eprintclass
        howpublished
        institution
        journal
        key
        month
        note
        number
        organization
        pages
        primaryclass
        publisher
        school
        series
        title
        type
        volume
        year
            % New keys recognized
            issue         % UTAH: used in, e.g., ACM SIGSAM Bulletin and ACM Communications in Computer Algebra
            articleno
            eid
            day           % UTAH: needed for newspapers, weeklies, bi-weeklies
            doi           % UTAH
            url           % UTAH
            bookpages     % UTAH
            numpages
            lastaccessed  % UTAH: used only for @Misc{...}
            coden         % UTAH
            isbn          % UTAH
            isbn-13       % UTAH
            issn          % UTAH
            lccn          % UTAH
      }
      {}
      { label.year extra.label sort.year sort.label basic.label.year}
    
    INTEGERS { output.state before.all mid.sentence after.sentence after.block }
    
    INTEGERS { show-isbn-10-and-13 }  % initialized below in begin.bib
    
    INTEGERS { nameptr namesleft numnames }
    
    INTEGERS { multiresult }
    
    INTEGERS { len }
    
    INTEGERS { last.extra.num }
    
    STRINGS { s t t.org u }
    
    STRINGS { last.label next.extra }
    
    STRINGS { p1 p2 p3 page.count }
    
    
    FUNCTION { not }
    {
        { #0 }
        { #1 }
      if$
    }
    
    FUNCTION { and }
    {
        'skip$
        { pop$ #0 }
      if$
    }
    
    FUNCTION { or }
    {
       { pop$ #1 }
        'skip$
      if$
    }
    
    
    FUNCTION { dump.stack.1 }
    {
        duplicate$ "STACK[top] = [" swap$ * "]" * warning$
    }
    
    FUNCTION { dump.stack.2 }
    {
        duplicate$ "STACK[top  ] = [" swap$ * "]" * warning$
        swap$
        duplicate$ "STACK[top-1] = [" swap$ * "]" * warning$
        swap$
    }
    
    FUNCTION { empty.or.unknown }
    {
      %% Examine the top stack entry, and push 1 if it is empty, or
      %% consists only of whitespace, or is a string beginning with two
      %% queries (??), and otherwise, push 0.
      %%
      %% This function provides a replacement for empty$, with the
      %% convenient feature that unknown values marked by two leading
      %% queries are treated the same as missing values, and thus, do not
      %% appear in the output .bbl file, and yet, their presence in .bib
      %% file(s) serves to mark values which are temporarily missing, but
      %% are expected to be filled in eventually once more data is
      %% obtained.  The TeX User Group and BibNet bibliography archives
      %% make extensive use of this practice.
      %%
      %% An empty string cannot serve the same purpose, because just as in
      %% statistics data processing, an unknown value is not the same as an
      %% empty value.
      %%
      %% At entry: stack = ... top:[string]
      %% At exit:  stack = ... top:[0 or 1]
    
      duplicate$ empty$
        { pop$ #1 }
        { #1 #2 substring$ "??" = }
      if$
    }
    
    FUNCTION { writeln }
    {
      %% In BibTeX style files, the sequences
      %%
      %%     ... "one" "two" output
      %%     ... "one" "two" output.xxx
      %%
      %% ship "one" to the output file, possibly following by punctuation,
      %% leaving the stack with
      %%
      %%     ... "two"
      %%
      %% There is thus a one-string lag in output processing that must be
      %% carefully handled to avoid duplicating a string in the output
      %% file.  Unless otherwise noted, all output.xxx functions leave
      %% just one new string on the stack, and that model should be born
      %% in mind when reading or writing function code.
      %%
      %% BibTeX's asynchronous buffering of output from strings from the
      %% stack is confusing because newline$ bypasses the buffer.  It
      %% would have been so much easier for newline to be a character
      %% rather than a state of the output-in-progress.
      %%
      %% The documentation in btxhak.dvi is WRONG:  it says
      %%
      %%    newline$ Writes onto the bbl file what's accumulated in the
      %%             output buffer. It writes a blank line if and only
      %%             if the output buffer is empty. Since write$ does
      %%             reasonable line breaking, you should use this
      %%             function only when you want a blank line or an
      %%             explicit line break.
      %%
      %%    write$   Pops the top (string) literal and writes it on the
      %%             output buffer (which will result in stuff being
      %%             written onto the bbl file when the buffer fills
      %%             up).
      %%
      %% Examination of the BibTeX source code shows that write$ does
      %% indeed behave as claimed, but newline$ sends a newline character
      %% directly to the output file, leaving the stack unchanged.  The
      %% first line "Writes onto ... buffer." is therefore wrong.
      %%
      %% The original BibTeX style files almost always use "write$ newline$"
      %% in that order, so it makes sense to hide that pair in a private
      %% function like this one, named after a statement in Pascal,
      %% the programming language embedded in the BibTeX Web program.
    
      write$                % output top-of-stack string
      newline$              % immediate write of newline (not via stack)
    }
    
    FUNCTION { init.state.consts }
    {
      #0 'before.all :=
      #1 'mid.sentence :=
      #2 'after.sentence :=
      #3 'after.block :=
    }
    
    FUNCTION { output.nonnull }
    { % Stack in: ... R S T  Stack out: ... R T   File out: S<comma><space>
      's :=
      output.state mid.sentence =
        {
          ", " * write$
        }
        {
          output.state after.block =
            {
              add.period$ writeln
              "\newblock " write$
            }
            {
              output.state before.all =
                {
                  write$
                }
                {
                  add.period$ " " * write$
                }
              if$
            }
          if$
          mid.sentence 'output.state :=
        }
      if$
      s
    }
    
    FUNCTION { output.nonnull.dot.space }
    { % Stack in: ... R S T  Stack out: ... R T   File out: S<dot><space>
      's :=
      output.state mid.sentence =           % { "<DEBUG output.nonnull.dot.space>. " * write$ }
        {
          ". " * write$
        }
        {
          output.state after.block =
            {
              add.period$ writeln "\newblock " write$
            }
            {
              output.state before.all =
                {
                  write$
                }
                {
                  add.period$ " " * write$
                }
              if$
            }
          if$
          mid.sentence 'output.state :=
        }
      if$
      s
    }
    
    FUNCTION { output.nonnull.remove }
    { % Stack in: ... R S T  Stack out: ... R T   File out: S<space>
      's :=
      output.state mid.sentence =
        {
          " " * write$
        }
        {
          output.state after.block =
            {
              add.period$ writeln "\newblock " write$
            }
            {
              output.state before.all =
                {
                  write$
                }
                {
                  add.period$ " " * write$
                }
              if$
            }
          if$
          mid.sentence 'output.state :=
        }
      if$
      s
    }
    
    FUNCTION { output.nonnull.removenospace }
    { % Stack in: ... R S T  Stack out: ... R T   File out: S
      's :=
      output.state mid.sentence =
        {
          "" * write$
        }
        {
          output.state after.block =
            {
              add.period$ writeln "\newblock " write$
            }
            {
              output.state before.all =
                {
                  write$
                }
                {
                  add.period$ " " * write$
                }
              if$
            }
          if$
          mid.sentence 'output.state :=
        }
      if$
      s
    }
    
    FUNCTION { output }
    { % discard top token if empty, else like output.nonnull
      duplicate$ empty.or.unknown
        'pop$
        'output.nonnull
      if$
    }
    
    FUNCTION { output.dot.space }
    { % discard top token if empty, else like output.nonnull.dot.space
      duplicate$ empty.or.unknown
        'pop$
        'output.nonnull.dot.space
      if$
    }
    
    FUNCTION { output.removenospace }
    { % discard top token if empty, else like output.nonnull.removenospace
      duplicate$ empty.or.unknown
        'pop$
        'output.nonnull.removenospace
      if$
    }
    
    FUNCTION { output.check }
    { % like output, but warn if key name on top-of-stack is not set
      't :=
      duplicate$ empty.or.unknown
        { pop$ "empty " t * " in " * cite$ * warning$ }
        'output.nonnull
      if$
    }
    
    FUNCTION { bibinfo.output.check }
    { % like output.check, adding bibinfo field
      't :=
      duplicate$ empty.or.unknown
        { pop$ "empty " t * " in " * cite$ * warning$ }
        { "\bibinfo{" t "}{" * * swap$ * "}" *
          output.nonnull }
      if$
    }
    
    FUNCTION { output.check.dot.space }
    { % like output.dot.space, but warn if key name on top-of-stack is not set
      't :=
      duplicate$ empty.or.unknown
        { pop$ "empty " t * " in " * cite$ * warning$ }
        'output.nonnull.dot.space
      if$
    }
    
    FUNCTION { fin.block }
    { % functionally, but not logically, identical to fin.entry
       add.period$
       writeln
    }
    
    FUNCTION { fin.entry }
    {
       add.period$
       writeln
    }
    
    FUNCTION { new.sentence }
    { % update sentence state, with neither output nor stack change
      output.state after.block =
        'skip$
        {
          output.state before.all =
            'skip$
            { after.sentence 'output.state := }
          if$
        }
      if$
    }
    
    FUNCTION { fin.sentence }
    {
       add.period$
       write$
       new.sentence
       ""
    }
    
    FUNCTION { new.block }
    {
      output.state before.all =
        'skip$
        { after.block 'output.state := }
      if$
    }
    
    FUNCTION { output.coden }       % UTAH
    { % output non-empty CODEN as one-line sentence (stack untouched)
      coden empty.or.unknown
        { }
        { "\showCODEN{" coden * "}" * writeln }
      if$
    }
    
    FUNCTION { format.articleno }
    {
      articleno empty.or.unknown not eid empty.or.unknown not and
         { "Both articleno and eid are defined for " cite$ * warning$ }
         'skip$
      if$
      articleno empty.or.unknown eid empty.or.unknown and
         { "" }
         {
            numpages empty.or.unknown
              { "articleno or eid field, but no numpages field, in "
                cite$ * warning$ }
              { }
            if$
            eid empty.or.unknown
              { "Article \bibinfo{articleno}{" articleno * "}" * }
              { "Article \bibinfo{articleno}{" eid * "}" * }
            if$
         }
      if$
    }
    
    FUNCTION { format.year }
    { % push year string or "[n. d.]" onto output stack
      %% Because year is a mandatory field, we always force SOMETHING
      %% to be output
      "\bibinfo{year}{"
      year empty.or.unknown
        { "[n. d.]" }
        { year }
      if$
      *  "}" *
    }
    
    FUNCTION { format.day.month }
    { % push "day month " or "month " or "" onto output stack
      day empty.or.unknown
        {
          month empty.or.unknown
            { "" }
            { "\bibinfo{date}{" month * "} " *}
          if$
        }
        {
          month empty.or.unknown
            { "" }
            { "\bibinfo{date}{" day * " " * month * "} " *}
          if$
        }
      if$
    }
    
    FUNCTION { format.day.month.year }     % UTAH
    { % if month is empty, push "" else push "(MON.)" or "(DD MON.)"
      % Needed for frequent periodicals: 2008. ... New York Times C-1, C-2, C-17 (23 Oct.)
      % acm-*.bst addition: prefix parenthesized date string with
      % ", Article nnn "
      articleno empty.or.unknown eid empty.or.unknown and
        { "" }
        { output.state after.block =
           {", " format.articleno * }
           { format.articleno  }
          if$
        }
      if$
      " (" * format.day.month * format.year * ")" *
    }
    
    FUNCTION { output.day.month.year }     % UTAH
    { % if month is empty value, do nothing; else output stack top and
      % leave with new top string "(MON.)" or "(DD MON.)"
      % Needed for frequent periodicals: 2008. ... New York Times C-1, C-2, C-17 (23 Oct.)
      format.day.month.year
      output.nonnull.remove
    }
    
    FUNCTION { strip.doi } % UTAH
    { % Strip any Web address prefix to recover the bare DOI, leaving the
      % result on the output stack, as recommended by CrossRef DOI
      % documentation.
      % For example, reduce "http://doi.acm.org/10.1145/1534530.1534545" to
      % "10.1145/1534530.1534545".  That is later typeset and displayed as
      % doi:10.1145/1534530.1534545 as the LAST item in the reference list
      % entry.  Publisher Web sites wrap this with a suitable link to a real
      % URL to resolve the DOI, and the master https://doi.org/ address is
      % preferred, since publisher-specific URLs can disappear in response
      % to economic events.  All journals are encouraged by the DOI
      % authorities to use that typeset format and link procedures for
      % uniformity across all publications that include DOIs in reference
      % lists.
      % The numeric prefix is guaranteed to start with "10.", so we use
      % that as a test.
      % 2017-02-04 Added stripping of https:// (Boris)
      doi #1 #3 substring$ "10." =
        { doi }
        {
          doi 't :=  % get modifiable copy of DOI
    
          % Change https:// to http:// to strip both prefixes (BV)
    
          t #1 #8 substring$ "https://" =
            { "http://"  t #9 t text.length$ #8 - substring$ * 't := }
            { }
          if$
    
          t #1 #7 substring$ "http://" =
            {
                t #8 t text.length$ #7 - substring$ 't :=
    
                "INTERNAL STYLE-FILE ERROR" 's :=
    
                % search for next "/" and assign its suffix to s
    
                { t text.length$ }
                {
                  t #1 #1 substring$ "/" =
                    {
                      % save rest of string as true DOI (should be 10.xxxx/yyyy)
                      t #2 t text.length$ #1 - substring$ 's :=
                      "" 't :=    % empty string t terminates the loop
                    }
                    {
                      % discard first character and continue loop: t <= substring(t,2,last)
                      t #2 t text.length$ #1 - substring$ 't :=
                    }
                  if$
                }
                while$
    
                % check for valid DOI (should be 10.xxxx/yyyy)
                s #1 #3 substring$ "10." =
                  { }
                  { "unrecognized DOI substring " s * " in DOI value [" * doi * "]" * warning$ }
                if$
    
                s   % push the stripped DOI on the output stack
    
            }
            {
              "unrecognized DOI value [" doi * "]" * warning$
              doi   % push the unrecognized original DOI on the output stack
            }
          if$
        }
      if$
    }
    
    %
    % Change by BV: added standard prefix to URL
    %
    FUNCTION { output.doi } % UTAH
    { % output non-empty DOI as one-line sentence (stack untouched)
      doi empty.or.unknown
        { }
        {
          %% Use \urldef here for the same reason it is used in output.url,
          %% see output.url for further discussion.
          "\urldef\tempurl%" writeln
          "\url{https://doi.org/" strip.doi * "}" * writeln
          "\showDOI{\tempurl}" writeln
        }
      if$
    }
    
    FUNCTION { output.isbn }                % UTAH
    { % output non-empty ISBN-10 and/or ISBN-13 as one-line sentences (stack untouched)
      show-isbn-10-and-13
        {
          %% show both 10- and 13-digit ISBNs
          isbn empty.or.unknown
            { }
            {
              "\showISBNx{" isbn * "}" * writeln
            }
          if$
          isbn-13 empty.or.unknown
            { }
            {
              "\showISBNxiii{" isbn-13 * "}" * writeln
            }
          if$
        }
        {
          %% show 10-digit ISBNs only if 13-digit ISBNs not available
          isbn-13 empty.or.unknown
            {
              isbn empty.or.unknown
                { }
                {
                  "\showISBNx{" isbn * "}" * writeln
                }
              if$
            }
            {
              "\showISBNxiii{" isbn-13 * "}" * writeln
            }
          if$
        }
      if$
    }
    
    FUNCTION { output.issn } % UTAH
    { % output non-empty ISSN as one-line sentence (stack untouched)
      issn empty.or.unknown
        { }
        { "\showISSN{" issn * "}" * writeln }
      if$
    }
    
    FUNCTION { output.issue }
    { % output non-empty issue number as a one-line sentence (stack untouched)
      issue empty.or.unknown
        { }
        { "Issue " issue * "." * writeln }
      if$
    }
    
    FUNCTION { output.lccn } % UTAH
    { % return with stack untouched
      lccn empty.or.unknown
        { }
        { "\showLCCN{" lccn * "}" * writeln }
      if$
    }
    
    FUNCTION { output.note } % UTAH
    { % return with stack empty
      note empty.or.unknown
        { }
        { "\shownote{" note add.period$ * "}" * writeln }
      if$
    }
    
    FUNCTION { output.note.check } % UTAH
    { % return with stack empty
      note empty.or.unknown
        { "empty note in " cite$ * warning$ }
        { "\shownote{" note add.period$ * "}" * writeln }
      if$
    }
    
    FUNCTION { output.eprint } %
    { % return with stack empty
      eprint empty.or.unknown
        { }
        { "\showeprint"
             archiveprefix empty.or.unknown
               { eprinttype empty.or.unknown
                   { }
                   { "[" eprinttype "]" * * * }
                 if$
               }
               { "[" archiveprefix "l" change.case$ "]" * * * }
             if$
             "{" *
             primaryclass empty.or.unknown
               { eprintclass empty.or.unknown
                 { }
                 { eprintclass "/" * * }
                 if$
               }
               { primaryclass "/" * * }
             if$
             eprint "}" * *
             writeln
        }
      if$
    }
    
    
    %
    % Changes by BV 2011/04/15.  Do not output
    % url if doi is defined
    %
    FUNCTION { output.url } % UTAH
    { % return with stack untouched
      % output URL and associated lastaccessed fields
      doi empty.or.unknown
      {
        url empty.or.unknown
          { }
          {
              %% Use \urldef, outside \showURL, so that %nn, #, etc in URLs work
              %% correctly.  Put the actual URL on its own line to reduce the
              %% likelihood of BibTeX's nasty line wrapping after column 79.
              %% \url{} can undo this, but if that doesn't work for some reason
              %% the .bbl file would have to be repaired manually.
              "\urldef\tempurl%" writeln
              "\url{" url * "}" * writeln
    
              "\showURL{%" writeln
              lastaccessed empty.or.unknown
                { "" }
                { "Retrieved " lastaccessed * " from " * }
              if$
              "\tempurl}" * writeln
          }
          if$
      }
      { }
      if$
    }
    
    FUNCTION { output.year.check }
    { % warn if year empty, output top string and leave " YEAR<label>" on stack in mid-sentence
      year empty.or.unknown
         { "empty year in " cite$ * warning$
           write$
           " \bibinfo{year}{[n. d.]}"
           "\natexlab{" extra.label * "}" * *
           mid.sentence 'output.state :=
         }
         { write$
           " \bibinfo{year}{" year * "}"  *
           "\natexlab{" extra.label * "}" * *
           mid.sentence 'output.state :=
         }
      if$
    }
    
    
    FUNCTION { le }
    {
      %% test whether first number is less than or equal to second number
      %% stack in:  n1 n2
      %% stack out: if n1 <= n2 then 1 else 0
    
      %% "DEBUG: le " cite$ * warning$
      > { #0 } { #1 } if$
    }
    
    FUNCTION { ge }
    {
      %% test whether first number is greater than or equal to second number
      %% stack in:  n1 n2
      %% stack out: if n1 >= n2 then 1 else 0
    
      %% "DEBUG: ge " cite$ * warning$
      < { #0 } { #1 } if$
    }
    
    FUNCTION { is.leading.digit }
    {
      %% test whether first character of string is a digit
      %% stack in:  string
      %% stack out: if first-char-is-digit then 1 else 0
    
      #1 #1 substring$                      % replace string by string[1:1]
      duplicate$                            % string[1:1] string[1:1]
      chr.to.int$
      "0" chr.to.int$ swap$ le              % "0" <= string[1:1] --> 0-or-1
      swap$                                 % 0-or-1 string[1:1]
      chr.to.int$
      "9" chr.to.int$ le                    % string[1:1} <= "9" --> 0-or-1
      and
    }
    
    FUNCTION { skip.digits }
    {
      %% skip over leading digits in string
      %% stack in:  string
      %% stack out: rest-of-string leading-digits
    
      %% "DEBUG: enter skip.digits " cite$ * warning$
    
      %% dump.stack.1
    
      duplicate$
      't :=
      't.org :=
      "" 'u :=
    
      { t text.length$ }
      {
        %% "=================DEBUG: skip.digits   t = [" t * "]" * warning$
        t is.leading.digit
          { t #2 t text.length$ #1 - substring$ }
          {
            t 'u :=
            ""
          }
        if$
        't :=
      }
      while$
    
      u                                                             % rest of string
      t.org #1 t.org text.length$ u text.length$ - substring$       % leading digits
    
      %% "DEBUG: t.org = [" t.org * "]" * warning$
      %% "DEBUG: u     = [" u * "]" * warning$
    
      %% dump.stack.2
    
      %% "DEBUG: leave skip.digits " cite$ * warning$
    }
    
    FUNCTION { skip.nondigits }
    {
      %% skip over leading nondigits in string
      %% stack in:  string
      %% stack out: rest-of-string
    
      %% "DEBUG: enter skip.nondigits " cite$ * warning$
    
      't :=
      "" 'u :=
    
      { t text.length$ }
      {
        %% "=================DEBUG: skip.nondigits   t = [" t * "]" * warning$
        t is.leading.digit
          {
            t 'u :=
            ""
          }
          { t #2 t text.length$ #1 - substring$ }
        if$
        't :=
      }
      while$
    
      u                     % rest of string
    
      %% dump.stack.1
      %% "DEBUG: leave skip.nondigits " cite$ * warning$
    }
    
    FUNCTION { parse.next.number }
    {
      %% stack in:  string
      %% stack out: rest-of-string next-numeric-part-of-string
      %% Example:
      %% stack in:  "123:1--123:59"
      %% stack out: ":1--123:59" "123"
    
      's :=
      s skip.nondigits 's :=
      s skip.digits
    }
    
    FUNCTION { reduce.pages.to.page.count }
    {
      %% Stack in:  arbitrary-and-unused
      %% Stack out: unchanged
      %%
      %% For the new-style pagination with article number and numpages or
      %% pages, we expect to have BibTeX entries containing something like
      %%     articleno = "17",
      %%     pages     = "1--23",
      %% with output "Article 17, 23 pages",
      %% or
      %%     articleno = "17",
      %%     numpages  = "23",
      %% with output "Article 17, 23 pages",
      %% or
      %%     articleno = "17",
      %%     pages     = "17:1--17:23",
      %% with output "Article 17, 23 pages",
      %%
      %% If articleno is missing or empty, then we should output "1--23",
      %% "23" (with a warning of a missing articleno), or "17:1--17:23",
      %% respectively.
    
      %% "DEBUG: enter reduce.pages.to.page.count " cite$ * warning$
    
      %% "DEBUG: pages = [" pages * "]" * warning$
    
      pages
      parse.next.number 'p1 :=
      parse.next.number 'p2 :=
      parse.next.number 'p3 :=
      parse.next.number 'page.count :=
    
      duplicate$
      empty.or.unknown
        {  }
        {
          duplicate$ "unexpected trailing garbage [" swap$ *
          "] after n:p1--n:p2 in pages = [" *
          pages *
          "] in " *
          cite$ *
          warning$
        }
      if$
    
      pop$
    
      %% "DEBUG: reduce.pages.to.page.count: "
      %% " p1 = " p1 * *
      %% " p2 = " p2 * *
      %% " p3 = " p3 * *
      %% " p4 = " page.count * *
      %% " in " cite$ * * warning$
    
      p1 p3 =   p2 "1" =   and   numpages empty.or.unknown   and
        { "INFO: reduced pages = [" pages * "] to numpages = [" * page.count * "]" * warning$ }
        {
          numpages empty.or.unknown
            { pages }
            { numpages }
          if$
          'page.count :=
        }
      if$
    
      p1 "1" =   p3 empty.or.unknown   and   numpages empty.or.unknown   and
        {
          p2 'page.count :=
          "INFO: reduced pages = [" pages * "] to numpages = [" * page.count * "]" * warning$
        }
        {
          numpages empty.or.unknown
            { pages }
            { numpages }
          if$
          'page.count :=
        }
      if$
    
      %% "DEBUG: leave reduce.pages.to.page.count " cite$ * warning$
    }
    
    FUNCTION { new.block.checkb }
    { % issue a new.block only if at least one of top two stack strings is not empty
      empty.or.unknown
      swap$ empty.or.unknown
      and
        'skip$
        'new.block
      if$
    }
    
    FUNCTION { field.or.null }
    { % convert empty value to null string, else return value
      duplicate$ empty.or.unknown
        { pop$ "" }
        'skip$
      if$
    }
    
    
    
    FUNCTION { emphasize }
    { % emphasize a non-empty top string on the stack
      duplicate$ empty.or.unknown
        { pop$ "" }
        { "\emph{" swap$ * "}" * }
      if$
    }
    
    FUNCTION { comma }
    { % convert empty string to null string, or brace string and add trailing comma
      duplicate$ empty.or.unknown
        { pop$ "" }
        { "{" swap$ * "}," * }
      if$
    }
    
    FUNCTION { format.names }
    {
      % Format bibliographical entries with the first author last name first,
      % and subsequent authors with initials followed by last name.
      % All names are formatted in this routine.
    
      's :=
      #1 'nameptr :=               % nameptr = 1;
      s num.names$ 'numnames :=    % numnames = num.name$(s);
      numnames 'namesleft :=
        { namesleft #0 > }
        { nameptr #1 =
            %NO: BAD ORDER: {"{" s nameptr "{ff~}{ll}{, jj}{, vv}" format.name$ * "}" * 't := }
            %NO: BAD ORDER: {"{" s nameptr "{ff~}{ll}{, jj}{, vv}" format.name$ * "}" * 't := }
            {"\bibinfo{person}{" s nameptr "{ff }{vv }{ll}{, jj}" format.name$ * "}" * 't := }
            {"\bibinfo{person}{" s nameptr "{ff }{vv }{ll}{, jj}" format.name$ * "}" * 't := }
          if$
          nameptr #1 >
            {
              namesleft #1 >
                { ", " * t * }
                {
                  numnames #2 >
                    { "," * }
                    'skip$
                  if$
                  t "\bibinfo{person}{others}" =
                    { " {et~al\mbox{.}}" * } % jrh: avoid spacing problems
                    { " {and} " * t * } % from Chicago Manual of Style
                  if$
                }
              if$
            }
            't
          if$
          nameptr #1 + 'nameptr :=          % nameptr += 1;
          namesleft #1 - 'namesleft :=      % namesleft =- 1;
        }
      while$
    }
    
    FUNCTION { my.full.label }
    {
      's :=
      #1 'nameptr :=               % nameptr = 1;
      s num.names$ 'numnames :=    % numnames = num.name$(s);
      numnames 'namesleft :=
        { namesleft #0 > }
    
        { s nameptr "{vv~}{ll}" format.name$ 't :=  % get the next name
          nameptr #1 >
            {
              namesleft #1 >
                { ", " * t * }
                {
                  numnames #2 >
                    { "," * }
                    'skip$
                  if$
                  t "others" =
                    { " et~al\mbox{.}" * } % jrh: avoid spacing problems
                    { " and " * t * } % from Chicago Manual of Style
                  if$
                }
              if$
            }
            't
          if$
          nameptr #1 + 'nameptr :=          % nameptr += 1;
          namesleft #1 - 'namesleft :=      % namesleft =- 1;
        }
      while$
    
    }
    
    FUNCTION { format.names.fml }
    {
      % Format names in "familiar" format, with first initial followed by
      % last name. Like format.names, ALL names are formatted.
      % jtb: The names are NOT put in small caps
    
      's :=
      #1 'nameptr :=               % nameptr = 1;
      s num.names$ 'numnames :=    % numnames = num.name$(s);
      numnames 'namesleft :=
        { namesleft #0 > }
    
        {
          "\bibinfo{person}{" s nameptr "{ff~}{vv~}{ll}{, jj}" format.name$ * "}" * 't :=
    
          nameptr #1 >
            {
              namesleft #1 >
                { ", " * t * }
                {
                  numnames #2 >
                    { "," * }
                    'skip$
                  if$
                  t "\bibinfo{person}{others}" =
                    { " {et~al\mbox{.}}" * }
                    { " {and} " * t * }
                  if$
                }
              if$
            }
            't
          if$
          nameptr #1 + 'nameptr :=          % nameptr += 1;
          namesleft #1 - 'namesleft :=      % namesleft =- 1;
        }
      while$
    }
    
    FUNCTION { format.authors }
    {
      author empty.or.unknown
        { "" }
        {
          "\bibfield{author}{"
          author format.names add.period$ * "}" *} % jtb: add period if none before
      if$
    }
    
    FUNCTION { format.key }
    {
      empty.or.unknown
        { key field.or.null }
        { "" }
      if$
    }
    
    FUNCTION { format.no.key }
    {
      empty.or.unknown
        { "" }
        { "" }
      if$
    }
    
    FUNCTION { format.editors.fml }
    {
      % Format editor names for use in the "in" types: inbook, incollection,
      % inproceedings: first initial, then last names. When editors are the
      % LABEL for an entry, then format.editor is used which lists editors
      % by last name first.
    
      editor empty.or.unknown
        { "" }
        {
          "\bibfield{editor}{"
          editor format.names.fml
          *  "}" *
          editor num.names$ #1 >
            { " (Eds.)" * }
            { " (Ed.)" * }
          if$
        }
      if$
    }
    
    FUNCTION { format.editors }
    { % format editor names for use in labels, last names first.
      editor empty.or.unknown
        { "" }
        {
          "\bibfield{editor}{"
          editor format.names
          *  "}" *
          editor num.names$ #1 >
            { " (Eds.)." * }
            { " (Ed.)." * }
          if$
        }
      if$
    }
    
    FUNCTION { format.articletitle }
    {
      title empty.or.unknown
        { "" }
        % Use this to preserve lettercase in titles:
        { "\showarticletitle{" title * "}" * }
        % Use this for downcase title style:
        % { \showarticletitle{" title "t" change.case$ * "}" * }
      if$
    }
    
    FUNCTION { format.title }
    {
      title empty.or.unknown
        { "" }
        % Use this to preserve lettercase in titles:
        { "\bibinfo{title}{" title * "}" * }
        % Use this for downcase title style:
        % { title "t" change.case$ }
      if$
    }
    
    FUNCTION { n.dashify }
    {
      't :=
      ""
        { t empty.or.unknown not }
        {
          t #1 #1 substring$ "-" =
            {
              t #1 #2 substring$ "--" = not
                { "--" *
                  t #2 global.max$ substring$ 't :=
                }
                {
                  { t #1 #1 substring$ "-" = }
                  {
                    "-" *
                    t #2 global.max$ substring$ 't :=
                  }
                  while$
                }
              if$
            }
            {
              t #1 #1 substring$ *
              t #2 global.max$ substring$ 't :=
            }
          if$
        }
      while$
    }
    
    FUNCTION { format.a.title.with.edition }
    {
      "\bibinfo{booktitle}{"
      swap$ emphasize *
      edition empty.or.unknown
        'skip$
        { " (\bibinfo{edition}{" * edition "l" change.case$ *
          "} ed.)" * } % jtb: no parens for ed.
      if$
      "}" *
    }
    
    FUNCTION { format.btitle }
    { title format.a.title.with.edition }
    
    FUNCTION { format.emphasize.booktitle }
    { booktitle format.a.title.with.edition }
    
    FUNCTION { format.city }
    {
      % jtb: if the preceding string (the title of the conference) is non-empty,
      % jtb: append the location, otherwise leave empty (so as to trigger the
      % jtb: error message in output.check
    
      duplicate$ empty.or.unknown
        { }
        {
          city empty.or.unknown
            {
              date empty.or.unknown
                { }
                { " (" * date * ")" * }
              if$
            }
            {
              date empty.or.unknown
                { " (" * city * ")" * }
                { " (" * city * ", " * date * ")" * }
              if$
            }
          if$
        }
      if$
    }
    
    FUNCTION { tie.or.space.connect }
    {
      duplicate$ text.length$ #3 <
        { "~" }
        { " " }
      if$
      swap$ * *
    }
    
    FUNCTION { either.or.check }
    {
      empty.or.unknown
        'pop$
        { "can't use both " swap$ * " fields in " * cite$ * warning$ }
      if$
    }
    
    FUNCTION { format.bvolume }
    {
      % jtb: If there is a series, this is added and the volume trails after it.
      % jtb: Otherwise, "Vol" is Capitalized.
    
      volume empty.or.unknown
        { "" }
        {
          series empty.or.unknown
            { "Vol.~\bibinfo{volume}{" volume "}" * *}
            { "\bibinfo{series}{" series "}, " * *
              "Vol.~\bibinfo{volume}{" volume "}" * * *}
          if$
          "volume and number" number either.or.check
        }
      if$
    }
    
    FUNCTION { format.bvolume.noseries }
    {
      volume empty.or.unknown
        { "" }
        { "Vol.~\bibinfo{volume}{" volume "}" * *
          "volume and number" number either.or.check
        }
      if$
    }
    
    FUNCTION { format.series }
    {
      series empty.or.unknown
        {""}
        {" \emph{(\bibinfo{series}{" * series "})}" *}
      if$
    }
    
    FUNCTION { format.number.series }
    {
      volume empty.or.unknown
        {
          number empty.or.unknown
            {
              volume empty.or.unknown
              { "" }
              {
                series empty.or.unknown
                  { "" }
                  { " (\bibinfo{series}{" series * "})" * }
                if$
              }
              if$
            }                                       %    { series field.or.null }
            {
              output.state mid.sentence =
                { "Number" }                        % gnp - changed to mixed case always
                { "Number" }
              if$
              number tie.or.space.connect series empty.or.unknown
                { "there's a number but no series in " cite$ * warning$ }
                { " in \bibinfo{series}{" * series * "}" * }
              if$
            }
          if$
        }
        {
          ""
        }
      if$
    }
    
    FUNCTION { multi.page.check }
    {
      't :=
      #0 'multiresult :=
        { multiresult not
          t empty.or.unknown not
          and
        }
        { t #1 #1 substring$
          duplicate$ "-" =
          swap$ duplicate$ "," =
          swap$ "+" =
          or or
        { #1 'multiresult := }
        { t #2 global.max$ substring$ 't := }
          if$
        }
      while$
      multiresult
    }
    
    FUNCTION { format.pages }
    {
      pages empty.or.unknown
        { "" }
        { "\bibinfo{pages}{"
          pages multi.page.check
            { pages n.dashify } % gnp - removed () % jtb: removed pp.
            { pages }
          if$
          * "}" *
        }
      if$
    }
    
    FUNCTION { format.pages.check.without.articleno }
    { %% format pages field only if articleno is absent
      %% Stack out: pages-specification
      numpages missing$ pages missing$ and
        { "page numbers missing in both pages and numpages fields in " cite$ * warning$ }
        { }
      if$
    
      articleno empty.or.unknown eid empty.or.unknown and
        {
          pages missing$
            { numpages }
            { format.pages }
          if$
        }
        { "" }
      if$
    }
    
    FUNCTION { format.pages.check }
    {
      pages empty.or.unknown
        { "page numbers missing in " cite$ * warning$ "" }
        { pages n.dashify }
      if$
    }
    
    FUNCTION { format.bookpages }
    {
      bookpages empty.or.unknown
        { "" }
        { bookpages "book pages" tie.or.space.connect }
      if$
    }
    
    FUNCTION { format.named.pages }
    {
      pages empty.or.unknown
        { "" }
        { format.pages "pages" tie.or.space.connect }
      if$
    }
    
    %
    % Changed by Boris Veytsman, 2011-03-13
    % Now the word "pages" is printed even if
    % there field pages is not empty.
    %
    
    FUNCTION { format.page.count }
    {
      page.count empty.or.unknown
        { "" }
        { "\bibinfo{numpages}{" page.count * "}~pages" * }
      if$
    }
    
    FUNCTION { format.articleno.numpages }
    {
      %% There are seven possible outputs, depending on which fields are set.
      %%
      %% These four are handled here:
      %%
      %%     articleno, numpages, pages     -> "Article articleno-value, numpages-value pages"
      %%     articleno, numpages            -> "Article articleno-value, numpages-value pages"
      %%     articleno, pages               -> "Article articleno-value, reduced-pages-value pages"
      %%     articleno                      -> "Article articleno-value" and warn about missing numpages
      %%
      %% The remaining three have already been handled by
      %% format.pages.check.without.articleno:
      %%
      %%     numpages, pages                -> "pages-value"
      %%     numpages                       -> "numpages-value"
      %%     pages                          -> "pages-value"
      %%
      %% We no longer issue warninig when missing articleno, but having numpages
    
      articleno empty.or.unknown eid empty.or.unknown and
        {
    %%      numpages empty.or.unknown
    %%        { }
    %%        { "numpages field, but no articleno or eid field, in "
    %%          cite$ * warning$ }
    %%      if$
          ""
        }
        {
          numpages empty.or.unknown
            {
              pages empty.or.unknown
                {
                  "articleno or eid, but no pages or numpages field in "
                     cite$ * warning$
                  "" 'page.count :=
                }
                { reduce.pages.to.page.count }
              if$
            }
            { numpages 'page.count := }
          if$
    
          %% The Article number is now handled in format.day.month.year because
          %% ACM prefers the style "Digital Libraries 12, 3, Article 5 (July 2008)"
          %% over "Digital Libraries 12, 3 (July 2008), Article 5"
          %% format.articleno output
          format.page.count
        }
      if$
    }
    
    FUNCTION {calc.format.page.count}
    {
      numpages empty.or.unknown
       {
         pages empty.or.unknown
            {
            "" 'page.count :=
            }
            { reduce.pages.to.page.count }
         if$
       }
       { numpages 'page.count := }
      if$
      format.page.count
    }
    
    
    FUNCTION { journal.canon.abbrev }
    {
      % Returns a canonical abbreviation for 'journal', or else 'journal'
      % unchanged.
      journal "ACM Computing Surveys"                                                                       = { "Comput. Surveys"                                 } {
      journal "{ACM} Computing Surveys"                                                                     = { "Comput. Surveys"                                 } {
      journal "ACM Transactions on Mathematical Software"                                                   = { "ACM Trans. Math. Software"                       } {
      journal "{ACM} Transactions on Mathematical Software"                                                 = { "ACM Trans. Math. Software"                       } {
      journal "ACM SIGNUM Newsletter"                                                                       = { "ACM SIGNUM Newslett."                            } {
      journal "ACM {SIGNUM} Newsletter"                                                                     = { "ACM SIGNUM Newslett."                            } {
      journal "{ACM} SIGNUM Newsletter"                                                                     = { "ACM SIGNUM Newslett."                            } {
      journal "{ACM} {SIGNUM} Newsletter"                                                                   = { "ACM SIGNUM Newslett."                            } {
      journal "American Journal of Sociology"                                                               = { "Amer. J. Sociology"                              } {
      journal "American Mathematical Monthly"                                                               = { "Amer. Math. Monthly"                             } {
      journal "American Mathematical Society Translations"                                                  = { "Amer. Math. Soc. Transl."                        } {
      journal "Applied Mathematics and Computation"                                                         = { "Appl. Math. Comput."                             } {
      journal "British Journal of Mathematical and Statistical Psychology"                                  = { "Brit. J. Math. Statist. Psych."                  } {
      journal "Bulletin of the American Mathematical Society"                                               = { "Bull. Amer. Math. Soc."                          } {
      journal "Canadian Mathematical Bulletin"                                                              = { "Canad. Math. Bull."                              } {
      journal "Communications of the ACM"                                                                   = { "Commun. ACM"                                     } {
      journal "Communications of the {ACM}"                                                                 = { "Commun. ACM"                                     } {
      journal "Computers and Structures"                                                                    = { "Comput. \& Structures"                           } {
      journal "Contemporary Mathematics"                                                                    = { "Contemp. Math."                                  } {
      journal "Crelle's Journal"                                                                            = { "Crelle's J."                                     } {
      journal "Giornale di Mathematiche"                                                                    = { "Giorn. Mat."                                     } {
      journal "IEEE Transactions on Aerospace and Electronic Systems"                                       = { "IEEE Trans. Aerospace Electron. Systems"         } {
      journal "{IEEE} Transactions on Aerospace and Electronic Systems"                                     = { "IEEE Trans. Aerospace Electron. Systems"         } {
      journal "IEEE Transactions on Automatic Control"                                                      = { "IEEE Trans. Automat. Control"                    } {
      journal "{IEEE} Transactions on Automatic Control"                                                    = { "IEEE Trans. Automat. Control"                    } {
      journal "IEEE Transactions on Computers"                                                              = { "IEEE Trans. Comput."                             } {
      journal "{IEEE} Transactions on Computers"                                                            = { "IEEE Trans. Comput."                             } {
      journal "IMA Journal of Numerical Analysis"                                                           = { "IMA J. Numer. Anal."                             } {
      journal "{IMA} Journal of Numerical Analysis"                                                         = { "IMA J. Numer. Anal."                             } {
      journal "Information Processing Letters"                                                              = { "Inform. Process. Lett."                          } {
      journal "International Journal for Numerical Methods in Engineering"                                  = { "Internat. J. Numer. Methods Engrg."              } {
      journal "International Journal of Control"                                                            = { "Internat. J. Control"                            } {
      journal "International Journal of Supercomputing Applications"                                        = { "Internat. J. Supercomputing Applic."             } {
      journal "Journal of Computational Physics"                                                            = { "J. Comput. Phys."                                } {
      journal "Journal of Computational and Applied Mathematics"                                            = { "J. Comput. Appl. Math."                          } {
      journal "Journal of Computer and System Sciences"                                                     = { "J. Comput. System Sci."                          } {
      journal "Journal of Mathematical Analysis and Applications"                                           = { "J. Math. Anal. Appl."                            } {
      journal "Journal of Mathematical Physics"                                                             = { "J. Math. Phys."                                  } {
      journal "Journal of Parallel and Distributed Computing"                                               = { "J. Parallel and Distrib. Comput."                } {
      journal "Journal of Research of the National Bureau of Standards"                                     = { "J. Res. Nat. Bur. Standards"                     } {
      journal "Journal of VLSI and Computer Systems"                                                        = { "J. VLSI Comput. Syst."                           } {
      journal "Journal of {VLSI} and Computer Systems"                                                      = { "J. VLSI Comput. Syst."                           } {
      journal "Journal of the ACM"                                                                          = { "J. ACM"                                          } {
      journal "Journal of the American Statistical Association"                                             = { "J. Amer. Statist. Assoc."                        } {
      journal "Journal of the Institute of Mathematics and its Applications"                                = { "J. Inst. Math. Appl."                            } {
      journal "Journal of the Society for Industrial and Applied Mathematics"                               = { "J. Soc. Indust. Appl. Math."                     } {
      journal "Journal of the Society for Industrial and Applied Mathematics, Series B, Numerical Analysis" = { "J. Soc. Indust. Appl. Math. Ser. B Numer. Anal." } {
      journal "Linear Algebra and its Applications"                                                         = { "Linear Algebra Appl."                            } {
      journal "Mathematica Scandinavica"                                                                    = { "Math. Scand."                                    } {
      journal "Mathematical Tables and Other Aids to Computation"                                           = { "Math. Tables Aids Comput."                       } {
      journal "Mathematics of Computation"                                                                  = { "Math. Comp."                                     } {
      journal "Mathematische Annalen"                                                                       = { "Math. Ann."                                      } {
      journal "Numerische Mathematik"                                                                       = { "Numer. Math."                                    } {
      journal "Pacific Journal of Mathematics"                                                              = { "Pacific J. Math."                                } {
      journal "Parallel Computing"                                                                          = { "Parallel Comput."                                } {
      journal "Philosophical Magazine"                                                                      = { "Philos. Mag."                                    } {
      journal "Proceedings of the American Mathematical Society"                                            = { "Proc. Amer. Math. Soc."                          } {
      journal "Proceedings of the IEEE"                                                                     = { "Proc. IEEE"                                      } {
      journal "Proceedings of the {IEEE}"                                                                   = { "Proc. IEEE"                                      } {
      journal "Proceedings of the National Academy of Sciences of the USA"                                  = { "Proc. Nat. Acad. Sci. U. S. A."                  } {
      journal "Quarterly Journal of Mathematics, Oxford, Series (2)"                                        = { "Quart. J. Math. Oxford Ser. (2)"                 } {
      journal "Quarterly of Applied Mathematics"                                                            = { "Quart. Appl. Math."                              } {
      journal "Review of the International Statisical Institute"                                            = { "Rev. Inst. Internat. Statist."                   } {
      journal "SIAM Journal on Algebraic and Discrete Methods"                                              = { "SIAM J. Algebraic Discrete Methods"              } {
      journal "{SIAM} Journal on Algebraic and Discrete Methods"                                            = { "SIAM J. Algebraic Discrete Methods"              } {
      journal "SIAM Journal on Applied Mathematics"                                                         = { "SIAM J. Appl. Math."                             } {
      journal "{SIAM} Journal on Applied Mathematics"                                                       = { "SIAM J. Appl. Math."                             } {
      journal "SIAM Journal on Computing"                                                                   = { "SIAM J. Comput."                                 } {
      journal "{SIAM} Journal on Computing"                                                                 = { "SIAM J. Comput."                                 } {
      journal "SIAM Journal on Matrix Analysis and Applications"                                            = { "SIAM J. Matrix Anal. Appl."                      } {
      journal "{SIAM} Journal on Matrix Analysis and Applications"                                          = { "SIAM J. Matrix Anal. Appl."                      } {
      journal "SIAM Journal on Numerical Analysis"                                                          = { "SIAM J. Numer. Anal."                            } {
      journal "{SIAM} Journal on Numerical Analysis"                                                        = { "SIAM J. Numer. Anal."                            } {
      journal "SIAM Journal on Scientific and Statistical Computing"                                        = { "SIAM J. Sci. Statist. Comput."                   } {
      journal "{SIAM} Journal on Scientific and Statistical Computing"                                      = { "SIAM J. Sci. Statist. Comput."                   } {
      journal "SIAM Review"                                                                                 = { "SIAM Rev."                                       } {
      journal "{SIAM} Review"                                                                               = { "SIAM Rev."                                       } {
      journal "Software Practice and Experience"                                                            = { "Software Prac. Experience"                       } {
      journal "Statistical Science"                                                                         = { "Statist. Sci."                                   } {
      journal "The Computer Journal"                                                                        = { "Comput. J."                                      } {
      journal "Transactions of the American Mathematical Society"                                           = { "Trans. Amer. Math. Soc."                         } {
      journal "USSR Computational Mathematics and Mathematical Physics"                                     = { "U. S. S. R. Comput. Math. and Math. Phys."       } {
      journal "{USSR} Computational Mathematics and Mathematical Physics"                                   = { "U. S. S. R. Comput. Math. and Math. Phys."       } {
      journal "Zeitschrift fur Angewandte Mathematik und Mechanik"                                          = { "Z. Angew. Math. Mech."                           } {
      journal "Zeitschrift fur Angewandte Mathematik und Physik"                                            = { "Z. Angew. Math. Phys."                           } {
      journal
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
      } if$ } if$ } if$ } if$ } if$ } if$ } if$ } if$
    }
    
    FUNCTION { format.journal.volume.number.day.month.year }
    {
      % By Young (and Spencer)
      % GNP - fixed bugs with missing volume, number, and/or pages
      %
      % Format journal, volume, number, pages for article types.
      %
      journal empty.or.unknown
        { "no journal in " cite$ * warning$ "" }
        { "\bibinfo{journal}{"
          journal.canon.abbrev emphasize *
          "}" * }
      if$
    
      number empty.or.unknown
        {
          volume empty.or.unknown
            { "no number and no volume in " cite$ * warning$ "" * }
            { " " * " \bibinfo{volume}{" * volume * "}" * }
          if$
        }
        {
          volume empty.or.unknown
            {
              "unusual to have number, but no volume, for " cite$ * warning$
              " \bibinfo{number}{" * number * "}" *
            }
            { " \bibinfo{volume}{" * volume  * "}, \bibinfo{number}{" *
              number * "}" *}
          if$
        }
      if$
      after.block 'output.state :=
    
      % Sometimes proceedings are published in journals
      % In this case we do not want to put year, day and month here
    
      type$ "inproceedings" =
        { }
        {format.day.month.year * }
      if$
    }
    
    FUNCTION { format.chapter.pages }
    {
      chapter empty.or.unknown
        'format.pages
        { type empty.or.unknown
            { "Chapter" } % gnp - changed to mixed case
            { type "t" change.case$ }
          if$
          chapter tie.or.space.connect
          pages empty.or.unknown
            {"page numbers missing in " cite$ * warning$} % gnp - added check
            { ", " * format.pages * }
          if$
        }
      if$
    }
    
    FUNCTION { format.in.emphasize.booktitle }
    { % jtb: format for collections or proceedings not appearing in a journal
      booktitle empty.or.unknown
      { "" }
      { "In " format.emphasize.booktitle * }
      if$
    }
    
    FUNCTION { format.in.booktitle }
    { % jtb: format for proceedings appearing in a journal
      booktitle empty.or.unknown
      { "" }
      { "In \bibinfo{booktitle}{" booktitle * "}" * }
      if$
    }
    
    FUNCTION { format.in.ed.booktitle }
    {
      booktitle empty.or.unknown
      { "" }
      { editor empty.or.unknown
        { "In " format.emphasize.booktitle * }
                    % jtb: swapped editor location
        { "In " format.emphasize.booktitle * ", " * format.editors.fml * }
        if$
      }
      if$
    }
    
    FUNCTION { format.thesis.type }
    { % call with default type on stack top
      type empty.or.unknown
        'skip$    % use default type
        {
          pop$    % discard default type
          % NO: it is silly to have to brace protect every degree type!:  type "t" change.case$
          type
        }
      if$
    }
    
    FUNCTION { format.tr.number }
    {
      "\bibinfo{type}{"
      type empty.or.unknown
        { "{T}echnical {R}eport" }
        'type
      if$
      "}" * *
      number empty.or.unknown
        { "t" change.case$ }
        %% LOOKS BAD: { "." * number tie.or.space.connect }
        %% Prefer "Research report RJ687." to "Research report. RJ687."
        { number tie.or.space.connect }
      if$
    }
    
    FUNCTION { format.advisor }
    {
      advisor empty.or.unknown
        { "" }
        { "Advisor(s) " advisor * }
      if$
    }
    
    FUNCTION { format.article.crossref }
    { "See"
      "\citeN{" * crossref * "}" *
    }
    
    FUNCTION { format.crossref.editor }
    {
      editor #1 "{vv~}{ll}" format.name$
      editor num.names$ duplicate$
      #2 >
        { pop$ " et~al\mbox{.}" * }         % jrh: avoid spacing problems
        { #2 <
        'skip$
        { editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
            { " et~al\mbox{.}" * }          % jrh: avoid spacing problems
            { " and " * editor #2 "{vv~}{ll}" format.name$ * }
          if$
        }
          if$
        }
      if$
    }
    
    FUNCTION { format.book.crossref }
    {
      volume empty.or.unknown
        { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
          "In "
        }
        { "Volume" volume tie.or.space.connect % gnp - changed to mixed case
          " of " *
        }
      if$
      editor empty.or.unknown
      editor field.or.null author field.or.null =
      or
        { key empty.or.unknown
        { series empty.or.unknown
            { "need editor, key, or series for " cite$ * " to crossref " *
              crossref * warning$
              "" *
            }
            { series emphasize * }
          if$
        }
        { key * }
          if$
        }
        { format.crossref.editor * }
      if$
      " \citeN{" * crossref * "}" *
    }
    
    FUNCTION { format.incoll.inproc.crossref }
    { "See"
      " \citeN{" * crossref * "}" *
    }
    
    FUNCTION { format.lab.names }
    {
      % format.lab.names:
      %
      % determines "short" names for the abbreviated author information.
      % "Long" labels are created in calc.label, using the routine my.full.label
      % to format author and editor fields.
      %
      % There are 4 cases for labels.   (n=3 in the example)
      % a) one author             Foo
      % b) one to n               Foo, Bar and Baz
      % c) use of "and others"    Foo, Bar et al.
      % d) more than n            Foo et al.
    
      's :=
      s num.names$ 'numnames :=
      numnames #2 >    % change number to number of others allowed before
                       % forcing "et al".
        { s #1 "{vv~}{ll}" format.name$ " et~al\mbox{.}" * } % jrh: \mbox{} added
        {
          numnames #1 - 'namesleft :=
          #2 'nameptr :=
          s #1 "{vv~}{ll}" format.name$
            { namesleft #0 > }
            { nameptr numnames =
                { s nameptr "{ff }{vv }{ll}{ jj}" format.name$ "others" =
                    { " et~al\mbox{.}" * }          % jrh: avoid spacing problems
                    { " and " * s nameptr "{vv~}{ll}" format.name$ * }
                  if$
                }
                { ", " * s nameptr "{vv~}{ll}" format.name$ * }
              if$
              nameptr #1 + 'nameptr :=
              namesleft #1 - 'namesleft :=
            }
          while$
        }
      if$
    }
    
    FUNCTION { author.key.label }
    {
      author empty.or.unknown
        { key empty.or.unknown
              { "no key, author in " cite$ * warning$
                cite$ #1 #3 substring$ }
             'key
          if$
        }
        { author format.lab.names }
      if$
    }
    
    FUNCTION { editor.key.organization.label }
    { % added - gnp. Provide label formatting by organization if editor is null.
      editor empty.or.unknown
        { organization empty.or.unknown
            { key empty.or.unknown
                { "no key, editor or organization in " cite$ * warning$
                  cite$ #1 #3 substring$ }
                'key
              if$
            }
            { organization }
          if$
        }
        { editor format.lab.names }
      if$
    }
    
    FUNCTION { author.editor.key.label }
    {
      author empty.or.unknown
        { editor empty.or.unknown
              { key empty.or.unknown
                   { "no key, author, or editor in " cite$ * warning$
                     cite$ #1 #3 substring$ }
                 'key
               if$
             }
              { editor format.lab.names }
          if$
        }
        { author format.lab.names }
      if$
    }
    
    FUNCTION { author.editor.key.organization.label }
    { % added - gnp. Provide label formatting by organization if author is null.
      author empty.or.unknown
        { editor empty.or.unknown
            { organization empty.or.unknown
                { key empty.or.unknown
                   { "no key, author, editor or organization in " cite$ * warning$
                     cite$ #1 #3 substring$ }
                   'key
                  if$
                }
                { organization }
              if$
            }
            { editor format.lab.names }
          if$
        }
        { author format.lab.names }
      if$
    }
    
    % Calculate label and leave it on stack
    FUNCTION { calc.basic.label }
    {
      type$ "book" =
      type$ "inbook" =
      or
      type$ "article" =
      or
        'author.editor.key.label
        { type$ "proceedings" =
          type$ "periodical" =
          or
            'editor.key.organization.label
            { type$ "manual" =
                'author.editor.key.organization.label
                'author.key.label
              if$
            }
          if$
        }
      if$
      duplicate$
      year empty.or.unknown
        { "[n. d.]" }
        { year field.or.null purify$ #-1 #4 substring$}
      if$
      *
      'basic.label.year :=
    }
    
    FUNCTION { calc.label }
    {
      % Changed - GNP. See also author.editor.organization.sort, editor.organization.sort
      % Form label for BibTeX entry. The classification of which fields are used
      % for which type of entry (book, inbook, etc.) are taken from alpha.bst.
      % The change here from newapa is to also include organization as a
      % citation label if author or editor is missing.
    
      calc.basic.label
    
      author empty.or.unknown  % generate the full label citation information.
        {
          editor empty.or.unknown
            {
              organization empty.or.unknown
                {
                  key empty.or.unknown
                    {
                      "no author, editor, organization, or key in " cite$ * warning$
                      "??"
                    }
                    { key }
                  if$
                }
                { organization }
              if$
            }
            { editor my.full.label }
          if$
        }
        { author my.full.label }
      if$
    
      % leave label on the stack, to be popped when required.
    
      "}{" * swap$ * "}{" *
      %  year field.or.null purify$ #-1 #4 substring$ *
      %
      % save the year for sort processing afterwards (adding a, b, c, etc.)
      %
      year empty.or.unknown
        { "[n. d.]" }
        { year field.or.null purify$ #-1 #4 substring$}
      if$
      'label.year :=
    }
    
    
    FUNCTION { output.bibitem }
    {
      newline$
      "\bibitem[\protect\citeauthoryear{" write$
      calc.label write$
      sort.year write$
      "}]%" writeln
      "        {" write$
      cite$ write$
      "}" writeln
      ""
      before.all 'output.state :=
    }
    
    
    FUNCTION { output.issue.doi.coden.isxn.lccn.url.eprint }
    { % enter and return with stack empty
      %% We switch now from buffered output to output of complete lines, so
      %% that the Issue .. URL data have their own lines, and are less likely
      %% to be line-wrapped by BibTeX's short-sighted algorithm, which wraps
      %% lines longer than 79 characters, backtracking to what it thinks is
      %% a break point in the string.  Any such wrapping MUST be undone to
      %% prevent percent-newline from appearing in DOIs and URLs.  The
      %% output data are intentionally wrapped in \showxxx{} macros at
      %% beginning of line, and that supply their own punctuation (if they
      %% are not defined to suppress output entirely), to make it easier for
      %% other software to recover them from .bbl files.
      %%
      %% It also makes it possible to later change the macro definitions
      %% to suppress particular output values, or alter their appearance.
      %%
      %% Note that it is possible for theses, technical reports, and
      %% manuals to have ISBNs, and anything that has an ISBN may also
      %% have an ISSN.  When there are no values for these keys, there
      %% is no output generated for them here.
    
      "\newblock" writeln
      after.block 'output.state :=
    
      output.issue
      output.isbn
      output.coden  % CODEN is functionally like ISSN, so output them sequentially
      output.issn
      output.lccn
      output.doi    % DOI is ALWAYS last according to CrossRef DOI documentation
      output.eprint
      output.url    % but ACM wants URL last
    }
    
    FUNCTION { output.issue.doi.coden.isxn.lccn.url.eprint.note }
    { % enter with stack empty, return with empty string on stack
      output.issue.doi.coden.isxn.lccn.url.eprint
      note empty.or.unknown
        { }
        {
          "\newblock" writeln
          output.note
        }
      if$
      ""
    }
    
    FUNCTION { output.issue.doi.coden.isxn.lccn.url.eprint.note.check }
    { % enter with stack empty, return with empty string on stack
      output.issue.doi.coden.isxn.lccn.url.eprint
      note empty.or.unknown
        { }
        {
          "\newblock" writeln
          output.note.check
        }
      if$
      ""
    }
    
    FUNCTION { article }
    {
      output.bibitem
    
      author empty.or.unknown
        {
          editor empty.or.unknown
            { "neither author and editor supplied for " cite$ * warning$ }
            { format.editors "editor" output.check }
          if$
        }
        { format.authors "author" output.check }
      if$
    
      author format.no.key output       % added
      output.year.check                 % added
      new.block
      format.articletitle "title" output.check
      new.block
      howpublished empty.or.unknown
        { }
        { "\bibinfo{howpublished}{" howpublished "}" * * output }
      if$
    
      crossref missing$
        { format.journal.volume.number.day.month.year output}
        {
          "cross reference in @Article{...} is unusual" warning$
          format.article.crossref output.nonnull
        }
      if$
    
      format.pages.check.without.articleno output
      format.articleno.numpages output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { book }
    {
      output.bibitem
      author empty.or.unknown
        { format.editors "author and editor" output.check }
        { format.authors output.nonnull
          crossref missing$
            { "author and editor" editor either.or.check }
            'skip$
          if$
        }
      if$
      output.year.check       % added
      new.block
      format.btitle "title" output.check
      crossref missing$
        { new.sentence              % jtb: start a new sentence for series/volume
          format.bvolume output
          new.block
          format.number.series output
          new.sentence
          publisher "publisher" bibinfo.output.check
          address "address" bibinfo.output.check    % jtb: require address
          fin.sentence
          pages empty.or.unknown
            { format.bookpages }    % use bookpages when pages empty
            { format.pages.check "pages" tie.or.space.connect }
          if$
          output
        }
        { new.block
          format.book.crossref output.nonnull
        }
      if$
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { booklet }
    {
      output.bibitem
      format.authors output
      author format.key output          % added
      output.year.check                 % added
      new.block
      format.title "title" output.check
      new.block
        howpublished empty.or.unknown
        { }
        { "\bibinfo{howpublished}{" howpublished "}" * * output }
      if$
      address output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { inbook }
    {
      output.bibitem
      author empty.or.unknown
        { format.editors
          "author and editor" output.check
        }
        { format.authors output.nonnull
          crossref missing$
        { "author and editor" editor either.or.check }
        'skip$
          if$
        }
      if$
      output.year.check                 % added
      new.block
      format.btitle "title" output.check
      crossref missing$
        { new.sentence              % jtb: start a new sentence for series/volume
          format.bvolume output
          new.block
          format.number.series output
          new.sentence
          publisher "publisher" bibinfo.output.check
          address "address" bibinfo.output.check    % jtb: require address
          format.bookpages output
          format.chapter.pages
          "chapter and pages" output.check  % jtb: moved from before publisher
        }
        {
          format.bookpages output
          format.chapter.pages "chapter and pages" output.check
          new.block
          format.book.crossref output.nonnull
        }
      if$
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { incollection }
    {
      output.bibitem
      format.authors "author" output.check
      author format.key output       % added
      output.year.check              % added
      new.block
      format.articletitle "title" output.check
      new.block
      crossref missing$
        { format.in.ed.booktitle "booktitle" output.check
          new.sentence                % jtb: start a new sentence for series/volume
          format.bvolume output
          format.number.series output
          new.sentence
          publisher "publisher" bibinfo.output.check
          address "address" bibinfo.output.check      % jtb: require address
          format.bookpages output
          format.chapter.pages output % gnp - was special.output.nonnull
                                      % left out comma before page numbers
                                      % jtb: moved from before publisher
        }
        {
          format.incoll.inproc.crossref output.nonnull
          format.chapter.pages output
        }
      if$
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { inproceedings }
    {
      output.bibitem
      format.authors "author" output.check
      author format.key output            % added
      output.year.check                   % added
      new.block
      format.articletitle "title" output.check
      howpublished empty.or.unknown
        { }
        { "\bibinfo{howpublished}{" howpublished "}" * * output.dot.space }
      if$
      crossref missing$
        {
          journal missing$          % jtb: proceedings appearing in journals
            { format.in.emphasize.booktitle format.city "booktitle"  output.check.dot.space
              format.series output.removenospace
              format.editors.fml output % BV 2011/09/27 Moved dot to comma
              format.bvolume.noseries output
              new.sentence
              organization output
              publisher "publisher" bibinfo.output.check % jtb: require publisher (?)
              address "address" bibinfo.output.check  % jtb: require address
              format.bookpages output
            }
            {
               format.in.booktitle format.city "booktitle" output.check
               format.editors.fml output
               new.sentence
               format.journal.volume.number.day.month.year output
            }
          if$
          format.articleno output
          format.pages.check.without.articleno output
        }
        {
          format.incoll.inproc.crossref output.nonnull
          format.articleno output
          format.pages.check.without.articleno output
        }
      if$
      format.articleno.numpages output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { conference } { inproceedings }
    
    FUNCTION { manual }
    {
      output.bibitem
      author empty.or.unknown
        { editor empty.or.unknown
          { organization "organization" output.check
            organization format.key output }  % if all else fails, use key
          { format.editors "author and editor" output.check }
          if$
        }
        { format.authors output.nonnull }
        if$
      output.year.check                 % added
      new.block
      format.btitle "title" output.check
      organization address new.block.checkb
      % jtb: back to normal style: organization, address
      organization "organization" output.check
      address output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { mastersthesis }
    {
      output.bibitem
      format.authors "author" output.check
      author format.key output          % added
      output.year.check                 % added
      new.block
      format.title emphasize "title" output.check  % NB: ACM style requires emphasized thesis title
      new.block
      "\bibinfo{thesistype}{Master's\ thesis}" format.thesis.type output
      new.sentence
      school "school" bibinfo.output.check
      address empty.or.unknown
         { }
         { "\bibinfo{address}{" address * "}" * output }
      if$
      new.block
      format.advisor output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { misc }
    {
      output.bibitem
      format.authors "author" output.check
      author format.key output            % added
      output.year.check                   % added
      title howpublished new.block.checkb
      format.title output
      new.block
      howpublished empty.or.unknown
        { }
        { "\bibinfo{howpublished}{" howpublished "}" * * output }
      if$
      "" output.nonnull.dot.space
      calc.format.page.count output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { online } { misc }
    
    FUNCTION { game } { misc }
    
    
    FUNCTION { phdthesis }
    {
      output.bibitem
      format.authors "author" output.check
      author format.key output          % added
      output.year.check                 % added
      new.block
      format.title emphasize "title" output.check  % NB: ACM style requires emphasized thesis title
      new.block
      "\bibinfo{thesistype}{Ph.D. Dissertation}" format.thesis.type output
      new.sentence
      school "school" bibinfo.output.check
      address empty.or.unknown
         { }
         { "\bibinfo{address}{" address * "}" * output }
      if$
      new.block
      format.advisor output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION {format.date}
    { year empty.or.unknown
        { month empty.or.unknown
            {
              ""                    % output empty date if year/month both empty
              day empty.or.unknown
                {  }
                { "there's a day but no month or year in " cite$ * warning$ }
              if$
            }
            { "there's a month but no year in " cite$ * warning$
              month
              day empty.or.unknown
                { }
                { " " * day * }
              if$
            }
          if$
        }
        { month empty.or.unknown
            {
              year                  % output only year if month empty
              day empty.or.unknown
                {  }
                { "there's a day and year but no month in " cite$ * warning$ }
              if$
            }
            {
              month " " *
              day empty.or.unknown
                { }
                { day * ", " * }
              if$
              year *
            }
          if$
        }
      if$
    }
    
    FUNCTION {new.block.checka}
    {
      empty.or.unknown
        'skip$
        'new.block
      if$
    }
    
    FUNCTION { periodical }
    {
      output.bibitem
      editor empty.or.unknown
        { organization output }
        { format.editors output.nonnull }
      if$
      new.block
      output.year.check
      new.sentence
      format.articletitle "title" output.check
      format.journal.volume.number.day.month.year output
      calc.format.page.count output
      fin.entry
    }
    
    FUNCTION { proceedings }
    {
      output.bibitem
      editor empty.or.unknown
        { organization output
          organization format.key output }  % gnp - changed from author format.key
        { format.editors output.nonnull }
      if$
      % author format.key output             % gnp - removed (should be either
      %                                        editor or organization
      output.year.check                    % added (newapa)
      new.block
      format.btitle format.city "title" output.check        % jtb: added city
      new.sentence
      format.bvolume output
      format.number.series output
      new.sentence
      organization output
      % jtb: normal order: publisher, address
      publisher empty.or.unknown
         { }
         { "\bibinfo{publisher}{" publisher * "}" * output }
      if$
      address empty.or.unknown
         { }
         { "\bibinfo{address}{" address * "}" * output }
      if$
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { collection } { proceedings }
    
    FUNCTION { techreport }
    {
      output.bibitem
      format.authors "author" output.check
      author format.key output             % added
      output.year.check                    % added
      new.block
      format.btitle "title" output.check
      new.block
    %   format.tr.number output               % jtb: moved month ...
      format.tr.number output new.sentence    % Gerry  - need dot 2011/09/28
      institution "institution" bibinfo.output.check
      address empty.or.unknown
        { }
        { "\bibinfo{address}{" address "}" * * output }
      if$
      new.sentence
      format.named.pages output
      % ACM omits year at end in transactions style
      % format.day.month.year output.nonnull.dot.space  % jtb: ... to here (no parens)
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note
      fin.entry
    }
    
    FUNCTION { unpublished }
    {
      output.bibitem
      format.authors
      "author" output.check
      author format.key output              % added
      output.year.check                     % added
      new.block
      format.title "title" output.check
      fin.sentence
      output.day.month.year                 % UTAH
      calc.format.page.count output
      fin.block
      output.issue.doi.coden.isxn.lccn.url.eprint.note.check
      fin.entry
    }
    
    FUNCTION { default.type } { misc }
    
    %%% ACM journal-style month definitions: full name if 1--5 letters, else
    %%% abbreviation of 3 or 4 characters and a dot
    
    MACRO {jan}             {"Jan."}
    
    MACRO {feb}             {"Feb."}
    
    MACRO {mar}             {"March"}
    
    MACRO {apr}             {"April"}
    
    MACRO {may}             {"May"}
    
    MACRO {jun}             {"June"}
    
    MACRO {jul}             {"July"}
    
    MACRO {aug}             {"Aug."}
    
    MACRO {sep}             {"Sept."}
    
    MACRO {oct}             {"Oct."}
    
    MACRO {nov}             {"Nov."}
    
    MACRO {dec}             {"Dec."}
    
    
    
    READ
    
    FUNCTION { sortify }
    {
      purify$
      "l" change.case$
    }
    
    FUNCTION { chop.word }
    {
      's :=
      'len :=
      s #1 len substring$ =
        { s len #1 + global.max$ substring$ }
        's
      if$
    }
    
    FUNCTION { sort.format.names }
    {
      's :=
      #1 'nameptr :=
      ""
      s num.names$ 'numnames :=
      numnames 'namesleft :=
        { namesleft #0 > }
        { nameptr #1 >
              { "   " * }
             'skip$
          if$
          s nameptr "{vv{ } }{ll{ }}{  f{ }}{  jj{ }}" format.name$ 't :=
          nameptr numnames = t "others" = and
              { " et~al" * }
              { t sortify * }
          if$
          nameptr #1 + 'nameptr :=
          namesleft #1 - 'namesleft :=
        }
      while$
    }
    
    FUNCTION { sort.format.title }
    {
      't :=
      "A " #2
        "An " #3
          "The " #4 t chop.word
        chop.word
      chop.word
      sortify
      #1 global.max$ substring$
    }
    
    FUNCTION { author.sort }
    {
      author empty.or.unknown
        { key empty.or.unknown
             { "to sort, need author or key in " cite$ * warning$
               "" }
             { key sortify }
          if$
        }
        { author sort.format.names }
      if$
    }
    
    FUNCTION { author.editor.sort }
    {
      author empty.or.unknown
        {
          editor empty.or.unknown
             {
               key empty.or.unknown
                 { "to sort, need author, editor, or key in " cite$ * warning$
                   ""
                 }
                 { key sortify }
               if$
             }
             { editor sort.format.names }
          if$
        }
        { author sort.format.names }
      if$
    }
    
    FUNCTION { editor.organization.sort }
    {
      % added - GNP. Stack editor or organization for sorting (from alpha.bst).
      % Unlike alpha.bst, we need entire names, not abbreviations
    
      editor empty.or.unknown
        { organization empty.or.unknown
            { key empty.or.unknown
                { "to sort, need editor, organization, or key in " cite$ * warning$
                  ""
                }
                { key sortify }
              if$
            }
            { organization sortify }
          if$
        }
        { editor sort.format.names }
      if$
    }
    
    FUNCTION { author.editor.organization.sort }
    {
      % added - GNP. Stack author or organization for sorting (from alpha.bst).
      % Unlike alpha.bst, we need entire names, not abbreviations
    
      author empty.or.unknown
        {
          editor empty.or.unknown
            { organization empty.or.unknown
                { key empty.or.unknown
                    { "to sort, need author, editor, or key in " cite$ * warning$
                    ""
                    }
                    { key sortify }
                  if$
                }
                { organization sortify }
              if$
            }
            { editor sort.format.names }
          if$
        }
        { author sort.format.names }
      if$
    }
    
    FUNCTION { presort }
    {
      % Presort creates the bibentry's label via a call to calc.label, and then
      % sorts the entries based on entry type. Chicago.bst adds support for
      % including organizations as the sort key; the following is stolen from
      % alpha.bst.
    
      calc.label
      basic.label.year
      swap$
      "    "
      swap$
      * *
      "    "
      *
      sortify
      year field.or.null purify$ #-1 #4 substring$ * % add year
      "    "
      *
      type$ "book" =
      type$ "inbook" =
      or
      type$ "article" =
      or
        'author.editor.sort
        { type$ "proceedings" =
          type$ "periodical" =
          or
            'editor.organization.sort
            { type$ "manual" =
                'author.editor.organization.sort
                'author.sort
              if$
            }
          if$
        }
      if$
      #1 entry.max$ substring$        % added for newapa
      'sort.label :=                  % added for newapa
      sort.label                      % added for newapa
      *
      "    "
      *
      title field.or.null
      sort.format.title
      *
      #1 entry.max$ substring$
      'sort.key$ :=
    }
    
    
    
    ITERATE { presort }
    
    SORT             % by label, year, author/editor, title
    
    % From plainnat.bst
    STRINGS { longest.label }
    
    INTEGERS { longest.label.width number.label }
    
    FUNCTION {initialize.longest.label}
    { "" 'longest.label :=
      #0 int.to.chr$ 'last.label :=
      "" 'next.extra :=
      #0 'longest.label.width :=
      #0 'last.extra.num :=
      #0 'number.label :=
    }
    
    
    
    FUNCTION { initialize.extra.label.stuff }
    { #0 int.to.chr$ 'last.label :=
      "" 'next.extra :=
      #0 'last.extra.num :=
    }
    
    FUNCTION { forward.pass }
    {
      % Pass through all entries, comparing current entry to last one.
      % Need to concatenate year to the stack (done by calc.label) to determine
      % if two entries are the same (see presort)
    
      last.label
      calc.basic.label year field.or.null purify$ #-1 #4 substring$ * % add year
      #1 entry.max$ substring$ =     % are they equal?
         { last.extra.num #1 + 'last.extra.num :=
           last.extra.num int.to.chr$ 'extra.label :=
         }
         { "a" chr.to.int$ 'last.extra.num :=
           "" 'extra.label :=
           calc.basic.label year field.or.null purify$ #-1 #4 substring$ * % add year
           #1 entry.max$ substring$ 'last.label := % assign to last.label
         }
      if$
      number.label #1 + 'number.label :=
    }
    
    FUNCTION { reverse.pass }
    {
      next.extra "b" =
        { "a" 'extra.label := }
         'skip$
      if$
      label.year extra.label * 'sort.year :=
      extra.label 'next.extra :=
    }
    
    EXECUTE {initialize.extra.label.stuff}
    EXECUTE {initialize.longest.label}
    
    
    ITERATE {forward.pass}
    
    REVERSE {reverse.pass}
    
    FUNCTION { bib.sort.order }
    {
      sort.label
      "    "
      *
      year field.or.null sortify
      *
      "    "
      *
      title field.or.null
      sort.format.title
      *
      #1 entry.max$ substring$
      'sort.key$ :=
    }
    
    ITERATE { bib.sort.order }
    
    SORT             % by sort.label, year, title --- giving final bib. order.
    
    FUNCTION { begin.bib }
    {
      %% Set to #0 show 13-digit ISBN in preference to 10-digit ISBN.
      %% Set to #1 to show both 10-digit and 13-digit ISBNs.
      #1 'show-isbn-10-and-13 :=
    
      "%%% -*-BibTeX-*-" writeln
      "%%% Do NOT edit. File created by BibTeX with style" writeln
      "%%% ACM-Reference-Format-Journals [18-Jan-2012]." writeln
      "" writeln
    
      preamble$ empty.or.unknown
        'skip$
        { preamble$ writeln }
      if$
      "\begin{thebibliography}{" number.label int.to.str$ * "}" * writeln
      ""                                                                         writeln
      "%%% ====================================================================" writeln
      "%%% NOTE TO THE USER: you can override these defaults by providing"       writeln
      "%%% customized versions of any of these macros before the \bibliography"  writeln
      "%%% command.  Each of them MUST provide its own final punctuation,"       writeln
      "%%% except for \shownote{}, \showDOI{}, and \showURL{}.  The latter two"  writeln
      "%%% do not use final punctuation, in order to avoid confusing it with"    writeln
      "%%% the Web address."                                                     writeln
      "%%%"                                                                      writeln
      "%%% To suppress output of a particular field, define its macro to expand" writeln
      "%%% to an empty string, or better, \unskip, like this:"                   writeln
      "%%%"                                                                      writeln
      "%%% \newcommand{\showDOI}[1]{\unskip}   % LaTeX syntax"                   writeln
      "%%%"                                                                      writeln
      "%%% \def \showDOI #1{\unskip}           % plain TeX syntax"               writeln
      "%%%"                                                                      writeln
      "%%% ====================================================================" writeln
      ""                                                                         writeln
    
      %% ACM publications do not use CODEN, ISSN, and LCCN data, so their default
      %% macro wrappers expand to \unskip, discarding their values and unwanted
      %% space.
      %%
      %% For other publications, prior definitions like these may be useful:
      %%
      %%     Plain TeX:
      %%         \def \showCODEN     #1{CODEN #1.}
      %%         \def \showISSN      #1{ISSN #1.}
      %%         \def \showLCCN      #1{LCCN #1.}
      %%
      %%     LaTeX:
      %%         \newcommand{\showCODEN}[1]{CODEN #1.}
      %%         \newcommand{\showISSN}[1]#1{ISSN #1.}
      %%         \newcommand{\showLCCN}[1]{LCCN #1.}
    
      "\ifx \showCODEN    \undefined \def \showCODEN     #1{\unskip}     \fi" writeln
      "\ifx \showDOI      \undefined \def \showDOI       #1{#1}\fi" writeln
      % ACM styles omit ISBNs, but they can be included by suitable definitions of
      % \showISBNx and \showISBNxiii before the .bbl file is read
      "\ifx \showISBNx    \undefined \def \showISBNx     #1{\unskip}     \fi" writeln
      "\ifx \showISBNxiii \undefined \def \showISBNxiii  #1{\unskip}     \fi" writeln
      "\ifx \showISSN     \undefined \def \showISSN      #1{\unskip}     \fi" writeln
      "\ifx \showLCCN     \undefined \def \showLCCN      #1{\unskip}     \fi" writeln
      "\ifx \shownote     \undefined \def \shownote      #1{#1}          \fi" writeln % NB: final period supplied by add.period$ above
      "\ifx \showarticletitle \undefined \def \showarticletitle #1{#1}   \fi" writeln
      "\ifx \showURL      \undefined \def \showURL       {\relax}        \fi" writeln
      "% The following commands are used for tagged output and should be " writeln
      "% invisible to TeX" writeln
      "\providecommand\bibfield[2]{#2}" writeln
      "\providecommand\bibinfo[2]{#2}" writeln
      "\providecommand\natexlab[1]{#1}" writeln
      "\providecommand\showeprint[2][]{arXiv:#2}" writeln
    }
    
    EXECUTE {begin.bib}
    
    EXECUTE {init.state.consts}
    
    ITERATE {call.type$}
    
    FUNCTION { end.bib }
    {
      newline$
      "\end{thebibliography}"
      writeln
    }
    
    EXECUTE {end.bib}