Modeling Past and Future for Neural Machine Translation Zaixiang Zheng author Hao Zhou author Shujian Huang author Lili Mou author Xinyu Dai author Jiajun Chen author Zhaopeng Tu author 2018 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal zheng-etal-2018-modeling 10.1162/tacl_a_00011 https://aclanthology.org/Q18-1011/ 2018 6 145 157