B. Adler, and L. de Alfaro. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 261--270. New York, NY, USA, ACM Press, (2007)
E. Agirre, and A. Soroa. Proceedings of the Fourth International Workshop on Semantic Evaluations (SemEval-2007), page 7--12. Prague, Czech Republic, Association for Computational Linguistics, (June 2007)