J. Angele, und M. Gesmann. Proceedings of the Second International Conference on Rules and Rule Markup Languages for the Semantic Web, Athens, GA, USA, Seite 58-66. (2006)
G. Angelova. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), Volume 3596 von Lecture Notes in Computer Science, Seite 367-380. Springer, (2005)
F. Baader, B. Ganter, B. Sertkaya, und U. Sattler. Proceedings of the 20th international joint conference on Artifical intelligence, Seite 230--235. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2007)