Modality and Negation in Event Extraction Sander Bijl de Vroe author Liane Guillou author Miloš Stanojević author Nick McKenna author Mark Steedman author 2021-08 text Proceedings of the 4th Workshop on Challenges and Applications of Automated Extraction of Socio-political Events from Text (CASE 2021) Ali Hürriyetoğlu editor Association for Computational Linguistics Online conference publication bijl-de-vroe-etal-2021-modality 10.18653/v1/2021.case-1.6 https://aclanthology.org/2021.case-1.6/ 2021-08 31 42