Decontextualization: Making Sentences Stand-Alone Eunsol Choi author Jennimaria Palomaki author Matthew Lamm author Tom Kwiatkowski author Dipanjan Das author Michael Collins author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal choi-etal-2021-decontextualization 10.1162/tacl_a_00377 https://aclanthology.org/2021.tacl-1.27/ 2021 9 447 461