Add link to paper

README.md

@@ -9,11 +9,11 @@ datasets:
 # MathBERTa model
 
 Pretrained model on English language and LaTeX using a masked language modeling
-(MLM) objective. It was developed for [the ARQMath-3 shared task evaluation][1]
-at CLEF 2022 and first released in [this repository][2]. This model is
-case-sensitive: it makes a difference between english and English.
+(MLM) objective. It was introduced in [this paper][1] and first released in
+[this repository][2]. This model is case-sensitive: it makes a difference
+between english and English.
 
- [1]: https://www.cs.rit.edu/~dprl/ARQMath/
+ [1]: http://ceur-ws.org/Vol-3180/paper-06.pdf
  [2]: https://github.com/witiko/scm-at-arqmath3
 
 ## Model description