Expanding Paraphrase Lexicons by Exploiting Lexical Variants Atsushi Fujita author Pierre Isabelle author 2015-may–jun text Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Rada Mihalcea editor Joyce Chai editor Anoop Sarkar editor Association for Computational Linguistics Denver, Colorado conference publication fujita-isabelle-2015-expanding 10.3115/v1/N15-1065 https://aclanthology.org/N15-1065/ 2015-may–jun 630 640