A Feature-Enriched Tree Kernel for Relation Extraction Le Sun author Xianpei Han author 2014-06 text Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers) Kristina Toutanova editor Hua Wu editor Association for Computational Linguistics Baltimore, Maryland conference publication sun-han-2014-feature 10.3115/v1/P14-2011 https://aclanthology.org/P14-2011/ 2014-06 61 67