R. Mihalcea, C. Banea, and J. Wiebe. Proceedings of the Association for Computational Linguistics (ACL), page 976--983. Prague, Czech Republic, (June 2007)
R. McDonald, K. Hannan, T. Neylon, M. Wells, and J. Reynar. Proceedings of the Association for Computational Linguistics (ACL), page 432--439. Prague, Czech Republic, Association for Computational Linguistics, (June 2007)