Nested Named Entity Recognition with Span-level Graphs Juncheng Wan author Dongyu Ru author Weinan Zhang author Yong Yu author 2022-05 text Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Smaranda Muresan editor Preslav Nakov editor Aline Villavicencio editor Association for Computational Linguistics Dublin, Ireland conference publication wan-etal-2022-nested 10.18653/v1/2022.acl-long.63 https://aclanthology.org/2022.acl-long.63/ 2022-05 892 903