Hotho, Andreas and Jäschke, Robert and Schmitz, Christoph and Stumme, Gerd. BibSonomy: A Social Bookmark and Publication Sharing System. Proceedings of the First Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures. editor(s) de Moor, Aldo and Polovina, Simon and Delugach, Harry. 87-102, Aalborg Universitetsforlag, Aalborg, Year 2006.

Schmitz, Christoph and Hotho, Andreas and Jäschke, Robert and Stumme, Gerd. Mining Association Rules in Folksonomies. Data Science and Classification. Proceedings of the 10th IFCS Conf.. editor(s) Batagelj, V. and Bock, H.-H. and Ferligoj, A. and Žiberna, A.. Studies in Classification, Data Analysis, and Knowledge Organization, 261--270, Springer, Heidelberg, Year 2006.