Confidence Estimation for Knowledge Base Population Xiang Li author Ralph Grishman author 2013-09 text Proceedings of the International Conference Recent Advances in Natural Language Processing RANLP 2013 Ruslan Mitkov editor Galia Angelova editor Kalina Bontcheva editor INCOMA Ltd. Shoumen, BULGARIA Hissar, Bulgaria conference publication li-grishman-2013-confidence https://aclanthology.org/R13-1051/ 2013-09 396 401