A Span-Based Model for Joint Overlapped and Discontinuous Named Entity Recognition Fei Li author ZhiChao Lin author Meishan Zhang author Donghong Ji author 2021-08 text Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers) Chengqing Zong editor Fei Xia editor Wenjie Li editor Roberto Navigli editor Association for Computational Linguistics Online conference publication li-etal-2021-span 10.18653/v1/2021.acl-long.372 https://aclanthology.org/2021.acl-long.372/ 2021-08 4814 4828