Refining Grammars for Parsing with Hierarchical Semantic Knowledge Xiaojun Lin author Yang Fan author Meng Zhang author Xihong Wu author Huisheng Chi author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication lin-etal-2009-refining https://aclanthology.org/D09-1135/ 2009-08 1298 1307