B. Min, X. Li, R. Grishman, and S. Ang. Proceedings of the Fifth Text Analysis Conference (TAC 2012), National Institute of Standards and Technology (NIST), (November 2012)
H. Ji, and R. Grishman. Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies - Volume 1, page 1148--1158. Stroudsburg, PA, USA, Association for Computational Linguistics, (2011)