Event Argument Extraction using Causal Knowledge Structures Debanjana Kar author Sudeshna Sarkar author Pawan Goyal author 2020-12 text Proceedings of the 17th International Conference on Natural Language Processing (ICON) Pushpak Bhattacharyya editor Dipti Misra Sharma editor Rajeev Sangal editor NLP Association of India (NLPAI) Indian Institute of Technology Patna, Patna, India conference publication kar-etal-2020-event https://aclanthology.org/2020.icon-main.38/ 2020-12 287 296