R. Jäschke, A. Hotho, F. Mitzlaff, und G. Stumme. Recommender Systems for the Social Web, Volume 32 von Intelligent Systems Reference Library, Springer, Berlin/Heidelberg, (2012)
A. Hotho, R. Jäschke, C. Schmitz, und G. Stumme. Proceedings of the Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, Aalborg, Denmark, Aalborg University Press, (Juli 2006)