Semi-supervised Relation Extraction with Large-scale Word Clustering Ang Sun author Ralph Grishman author Satoshi Sekine author 2011-06 text Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies Dekang Lin editor Yuji Matsumoto editor Rada Mihalcea editor Association for Computational Linguistics Portland, Oregon, USA conference publication sun-etal-2011-semi https://aclanthology.org/P11-1053/ 2011-06 521 529