F. Mitzlaff, D. Benz, G. Stumme, and A. Hotho. HT '10: Proceedings of the 21st ACM Conference on Hypertext and Hypermedia, page 265--270. New York, NY, USA, ACM, (2010)
E. Zheleva, and L. Getoor. WWW '09: Proceedings of the 18th International Conference on World Wide Web, page 531--540. New York, NY, USA, ACM, (April 2009)