Knowledge Base Population: Successful Approaches and Challenges Heng Ji author Ralph Grishman 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 ji-grishman-2011-knowledge https://aclanthology.org/P11-1115/ 2011-06 1148 1158