Revisiting Negation in Neural Machine Translation Gongbo Tang author Philipp Rönchen author Rico Sennrich author Joakim Nivre author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal tang-etal-2021-revisiting 10.1162/tacl_a_00395 https://aclanthology.org/2021.tacl-1.45/ 2021 9 740 755