G. Stumme, and A. Maedche. IJCAI-2001 -- Proceedings of the 17th International Joint Conference on Artificial Intelligence, Seattle, USA, August, 1-6, 2001, page 225--234. San Francisco, Morgen Kaufmann, (2001)
B. Berendt, A. Hotho, and G. Stumme. International Semantic Web Conference, volume 2342 of Lecture Notes in Computer Science, page 264 - 278. Springer Verlag, (2002)
A. Hotho, R. Jäschke, C. Schmitz, and G. Stumme. Proceedings of the 3rd European Semantic Web Conference (accepted for publication), Budva, Montenegro, (June 2006)