F. Wu, and D. Weld. CIKM '07: Proceedings of the sixteenth ACM conference on Conference on information and knowledge management, page 41--50. New York, NY, USA, ACM, (2007)
R. Casado, E. Alfonseca, and P. Castells. Natural Language Processing and Information Systems: 10th International Conference on Applications of Natural Language to Information Systems, NLDB 2005, Alicante, Spain, June 15-17, 2005: Proceedings, (2005)
S. Ponzetto, and M. Strube. Proceedings of the main conference on Human Language Technology Conference of the North American Chapter of the Association of Computational Linguistics, (2006)