Reformat bib file

gipp.bib

@@ -1350,11 +1350,13 @@
   location  = {Fort Worth, USA},
   publisher = {ACM},
   url       = {http://doi.acm.org/10.1145/3197026.3197058},
+  biburl    = {https://dblp.org/rec/bib/conf/jcdl/SchubotzGSMCG18},
   booktitle = {Proceedings of the 18th {ACM/IEEE} on Joint Conference on Digital Libraries, {JCDL} 2018, Fort Worth, TX, USA, June 03-07, 2018},
   date      = {2018},
   doi       = {10.1145/3197026.3197058},
   keywords  = {SchubotzCV},
   pages     = {233--242},
+  preprint  = {https://arxiv.org/pdf/1804.04956.pdf},
   title     = {Improving the Representation and Conversion of Mathematical Formulae by Considering their Textual Context},
 }