Chinese Word Segmentation at Peking University Huiming Duan author Xiaojing Bai author Baobao Chang author Shiwen Yu author 2003-07 text Proceedings of the Second SIGHAN Workshop on Chinese Language Processing Association for Computational Linguistics Sapporo, Japan conference publication duan-etal-2003-chinese 10.3115/1119250.1119272 https://aclanthology.org/W03-1722/ 2003-07 152 155