T. Zesch, and I. Gurevych. Proceedings of the TextGraphs-2 Workshop (NAACL-HLT), page 1--8. Rochester, Association for Computational Linguistics, (April 2007)
U. Brandes, P. Kenis, J. Lerner, and D. van Raaij. WWW '09: Proceedings of the 18th international conference on World wide web, page 731--740. New York, NY, USA, ACM, (2009)