A. Hotho, R. Jäschke, C. Schmitz, and G. Stumme. Proc. Workshop on Applications of Semantic Technologies, Informatik 2006, P-94, Dresden, (October 2006)
A. Hotho, S. Staab, and G. Stumme. Knowledge Discovery in Databases: PKDD 2003, 7th European Conference on Principles and Practice of Knowledge Discovery in Databases, volume 2838 of LNAI, page 217-228. Heidelberg, Springer, (2003)