Joint Entity and Relation Extraction for Legal Documents with Legal Feature Enhancement Yanguang Chen author Yuanyuan Sun author Zhihao Yang author Hongfei Lin author 2020-12 text Proceedings of the 28th International Conference on Computational Linguistics Donia Scott editor Nuria Bel editor Chengqing Zong editor International Committee on Computational Linguistics Barcelona, Spain (Online) conference publication chen-etal-2020-joint-entity 10.18653/v1/2020.coling-main.137 https://aclanthology.org/2020.coling-main.137/ 2020-12 1561 1571