C. Schmitz, A. Hotho, R. Jäschke, and G. Stumme. The Semantic Web: Research and Applications, volume 4011 of Lecture Notes in Computer Science, page 530--544. Berlin/Heidelberg, Springer, (June 2006)
M. Atzmueller, D. Benz, A. Hotho, and G. Stumme (Eds.) Technical report (KIS), 2010-10 Department of Electrical Engineering/Computer Science, Kassel University, (2010)
P. Cimiano, A. Hotho, G. Stumme, and J. Tane. Concept Lattices, volume 2961 of LNAI, page 189-207. Heidelberg, Second International Conference on Formal Concept Analysis, ICFCA 2004, Springer, (2004)