- volume 171 of CEUR Workshop Proceedings, Galway, Ireland, (November 2005)
- Proceedings of the GI Workshop "Lehren - Lernen - Wissen - Adaptivität" LLWA, Fachgruppe Maschinelles Lernen, Wissenentdeckung, Data Mining, Karlsruhe, Germany, page 72-79. (2003)
- Proc. 3rd Intl. Conf. on Formal Concept Analysis, volume 3403 of Lecture Notes in Computer Science, page 315-328. Springer, (2005)


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