diff --git a/gipp.bib b/gipp.bib
index 6e65c9639aff5a990da68b9fcc4c5ab17b4bc226..cd410de65807426d5875102cf047fbe99448a5ba 100644
--- a/gipp.bib
+++ b/gipp.bib
@@ -1,3 +1,4 @@
+% Encoding: UTF-8
 @article{Salton63,
   author       = {{S}alton, {G}.},
   publisher    = {ACM},
@@ -1708,5 +1709,22 @@
   title     = {Securing the Integrity of Time Series Data in Open Science Projects using Blockchain-based Trusted Timestamping},
 }
 
-@comment{jabref-meta: databaseType:biblatex;
-}
+@InProceedings{Scharpf2019b,
+  author    = {Philipp Scharpf and Ian Mackerracher and Moritz Schubotz and J{\"{o}}ran Beel and Corinna Breitinger and Bela Gipp},
+  title     = {\emph{AnnoMath TeX} - a formula identifier annotation recommender system for {STEM} documents},
+  booktitle = {Proceedings of the 13th {ACM} Conference on Recommender Systems, RecSys 2019, Copenhagen, Denmark, September 16-20, 2019},
+  year      = {2019},
+  editor    = {Toine Bogers and Alan Said and Peter Brusilovsky and Domonkos Tikk},
+  publisher = {{ACM}},
+  pages     = {532--533},
+  doi       = {10.1145/3298689.3347042},
+  url       = {https://doi.org/10.1145/3298689.3347042},
+  bibsource = {dblp computer science bibliography, https://dblp.org},
+  biburl    = {https://dblp.org/rec/bib/conf/recsys/ScharpfMSBBG19},
+  core      = {B:Core Rank B;http://portal.core.edu.au/conf-ranks/28/},
+  homepage  = {https://annomathtex.wmflabs.org/},
+  preprint  = {https://www.gipp.com/wp-content/papercite-data/pdf/scharpf2019b.pdf},
+  timestamp = {Wed, 09 Oct 2019 14:20:04 +0200},
+}
+
+@Comment{jabref-meta: databaseType:biblatex;}