G. Little, L. Chilton, M. Goldman, und R. Miller. Proceedings of the 23nd annual ACM symposium on User interface software and technology, Seite 57--66. New York, NY, USA, ACM, (2010)
A. Troy, G. Zhang, und Y. Tian. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 206--219. Berlin, Heidelberg, Springer-Verlag, (2007)
C. Robardet, und F. Feschet. IDEAL '00: Proceedings of the Second International Conference on Intelligent Data Engineering and Automated Learning, Data Mining, Financial Engineering, and Intelligent Agents, Seite 565--570. London, UK, Springer-Verlag, (2000)