Annotating the Propositions in the Penn Chinese Treebank Nianwen Xue author Martha Palmer author 2003-07 text Proceedings of the Second SIGHAN Workshop on Chinese Language Processing Association for Computational Linguistics Sapporo, Japan conference publication xue-palmer-2003-annotating 10.3115/1119250.1119257 https://aclanthology.org/W03-1707/ 2003-07 47 54