Omni-word Feature and Soft Constraint for Chinese Relation Extraction Yanping Chen author Qinghua Zheng author Wei Zhang author 2014-06 text Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Kristina Toutanova editor Hua Wu editor Association for Computational Linguistics Baltimore, Maryland conference publication chen-etal-2014-omni 10.3115/v1/P14-1054 https://aclanthology.org/P14-1054/ 2014-06 572 581