Semantic Neural Machine Translation Using AMR Linfeng Song author Daniel Gildea author Yue Zhang author Zhiguo Wang author Jinsong Su author 2019 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal song-etal-2019-semantic 10.1162/tacl_a_00252 https://aclanthology.org/Q19-1002/ 2019 7 19 31