A. Hotho, R. Jäschke, C. Schmitz, and G. Stumme. Proceedings of the Conceptual Structure Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, page 87-102. (2006)
M. Lux, and G. Dösinger. nternational Journal of Knowledge and Learning (IJKL), 3 (4/5):
515-528(2007)ISSN (Online): 1741-1017
ISSN (Print): 1741-1009.