Semi-Supervised Cause Identification from Aviation Safety Reports Isaac Persing author Vincent Ng author 2009-08 text Proceedings of the Joint Conference of the 47th Annual Meeting of the ACL and the 4th International Joint Conference on Natural Language Processing of the AFNLP Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication persing-ng-2009-semi https://aclanthology.org/P09-1095/ 2009-08 843 851