C. Cattuto, D. Benz, A. Hotho, and G. Stumme. The Semantic Web -- ISWC 2008, Proc.Intl. Semantic Web Conference 2008, volume 5318 of LNAI, page 615--631. Heidelberg, Springer, (2008)
M. Strube, and S. Ponzetto. Proceedings of the National Conference on Artificial Intelligence, 21, page 1419. Menlo Park, CA; Cambridge, MA; London; AAAI Press; MIT Press; 1999, (2006)
H. Li, and N. Abe. Proceedings of the 17th international conference on Computational linguistics-Volume 2, page 749--755. Association for Computational Linguistics, (1998)