Improving Massively Multilingual Neural Machine Translation and Zero-Shot Translation Biao Zhang author Philip Williams author Ivan Titov author Rico Sennrich author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication zhang-etal-2020-improving 10.18653/v1/2020.acl-main.148 https://aclanthology.org/2020.acl-main.148/ 2020-07 1628 1639