J. Wiebe, and E. Riloff. Proceedings of the 6th International Conference on Intelligent Text Processing and Computational Linguistics (CICLing-2005), page 486-497. Mexico City, Mexico, (2005)
J. Wiebe, and R. Mihalcea. ACL '06: Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the ACL, page 1065--1072. Morristown, NJ, USA, Association for Computational Linguistics, (2006)