F. Suchanek, G. Kasneci, and G. Weikum. Proceedings of the 16th international conference on World Wide Web, page 697--706. New York, NY, USA, ACM, (2007)
F. Abel, N. Henze, and D. Krause. Web Information Systems and Technologies, 4th International
Conference, WEBIST 2008, Funchal, Madeira, Portugal, May
4-7, 2008, Revised Selected Papers, volume 18 of Lecture Notes in Business Information Processing, page 199-213. Springer, (2008)