PKU_HIT: An Event Detection System Based on Instances Expansion and Rich Syntactic Features Shiqi Li author Pengyuan Liu author Tiejun Zhao author Qin Lu author Hanjing Li author 2010-07 text Proceedings of the 5th International Workshop on Semantic Evaluation Katrin Erk editor Carlo Strapparava editor Association for Computational Linguistics Uppsala, Sweden conference publication li-etal-2010-pku https://aclanthology.org/S10-1067/ 2010-07 304 307