K. Becker, G. Stumme, R. Wille, U. Wille, und M. Zickwolff. Knowledge Engineering and Knowledge Management Methods, Models, and Tools, Volume 1937 von Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (2000)
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)