The Backtranslation Score: Automatic MT Evalution at the Sentence Level without Reference Translations Reinhard Rapp author 2009-08 text Proceedings of the ACL-IJCNLP 2009 Conference Short Papers Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication rapp-2009-backtranslation https://aclanthology.org/P09-2034/ 2009-08 133 136