Looking for a Needle in a Haystack: A Comprehensive Study of Hallucinations in Neural Machine Translation Nuno M Guerreiro author Elena Voita author André Martins author 2023-05 text Proceedings of the 17th Conference of the European Chapter of the Association for Computational Linguistics Andreas Vlachos editor Isabelle Augenstein editor Association for Computational Linguistics Dubrovnik, Croatia conference publication guerreiro-etal-2023-looking 10.18653/v1/2023.eacl-main.75 https://aclanthology.org/2023.eacl-main.75/ 2023-05 1059 1075