Relation Extraction Using Convolution Tree Kernel Expanded with Entity Features Longhua Qian author Guodong Zhou author Qiaomin Zhu author Peide Qian author 2007-11 text Proceedings of the 21st Pacific Asia Conference on Language, Information and Computation The Korean Society for Language and Information (KSLI) Seoul National University, Seoul, Korea conference publication qian-etal-2007-relation http://hdl.handle.net/2065/29114 https://aclanthology.org/Y07-1043/ 2007-11 415 421