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)
A. Hotho, S. Staab, and G. Stumme. Principles of Data Mining and Knowledge Discovery, 7th European Conference, PKDD 2003, Dubrovnik, Croatia, September 22-26, 2003, page 217-228. Springer, (September 2003)
C. Schmitz, S. Staab, R. Studer, G. Stumme, and J. Tane. Proceedings of E-Learn 2002: World Conference on E-Learning in Corporate, Government, Healthcare, & Higher Education, October 15-19 2002, Montreal, Canada, page 909-915. (2002)
G. Stumme. Conceptual Structures at Work: 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of LNCS, page 109-125. Heidelberg, Springer, (2004)