Updates based on reviews

jump_lin_id/bibtexfile.bib

@@ -77,7 +77,7 @@
 }
 
 @article{kim2009ell_1,
-  title={$\backslash$ell\_1 Trend Filtering},
+  title={$\ell_1$ Trend Filtering},
   author={Kim, Seung-Jean and Koh, Kwangmoo and Boyd, Stephen and Gorinevsky, Dimitry},
   journal={SIAM review},
   volume={51},
@@ -150,3 +150,14 @@
   year={2002},
   organization={IEEE}
 }
+
+@article{parikh2014proximal,
+  title={Proximal algorithms},
+  author={Parikh, Neal and Boyd, Stephen and others},
+  journal={Foundations and Trends{\textregistered} in Optimization},
+  volume={1},
+  number={3},
+  pages={127--239},
+  year={2014},
+  publisher={Now Publishers, Inc.}
+}