Accurate Unlexicalized Parsing Dan Klein author Christopher D Manning author 2003-07 text Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Sapporo, Japan conference publication klein-manning-2003-accurate 10.3115/1075096.1075150 https://aclanthology.org/P03-1054/ 2003-07 423 430