A Two-Step Approach for Implicit Event Argument Detection Zhisong Zhang author Xiang Kong author Zhengzhong Liu author Xuezhe Ma author Eduard Hovy author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication zhang-etal-2020-two 10.18653/v1/2020.acl-main.667 https://aclanthology.org/2020.acl-main.667/ 2020-07 7479 7485