Syntax-Guided Controlled Generation of Paraphrases Ashutosh Kumar author Kabir Ahuja author Raghuram Vadapalli author Partha Talukdar author 2020 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal kumar-etal-2020-syntax 10.1162/tacl_a_00318 https://aclanthology.org/2020.tacl-1.22/ 2020 8 329 345