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)
K. Sugiyama. Series on software engineering and knowledge engineering ; 11 World Scientific, Singapore u.a., (2002)Kozo Sugiyama. Literaturverz. S. 203 - 212. $5GBV.