M. Hildebrand, J. van Ossenbruggen, and L. Hardman. International Semantic Web Conference, volume 4273 of Lecture Notes in Computer Science, page 272-285. Springer, (2006)
I. Titov, and A. Klementiev. Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies, page 1445--1455. Portland, Oregon, USA, Association for Computational Linguistics, (June 2011)