Update README.md

README.md

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 This a model to translate texts from the Erzya language (`myv`, cyrillic script) to 11 other languages: `ru,fi,de,es,en,hi,zh,tr,uk,fr,ar`.
 
-It is described in the paper "The first neural machine translation system for the Erzya language".
+It is described in the paper [The first neural machine translation system for the Erzya language](https://arxiv.org/abs/2209.09368).
 
 This model is based on [facebook/mbart-large-50](https://huggingface.co/facebook/mbart-large-50), but with updated vocabulary and checkpoint:
 - Added an extra language token `myv_XX` and 19K new BPE tokens for the Erzya language;