Hallucinations in Large Multilingual Translation Models Nuno M Guerreiro author Duarte M Alves author Jonas Waldendorf author Barry Haddow author Alexandra Birch author Pierre Colombo author André F T Martins author 2023 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal guerreiro-etal-2023-hallucinations 10.1162/tacl_a_00615 https://aclanthology.org/2023.tacl-1.85/ 2023 11 1500 1517