T. Yue, L. Briand, und Y. Labiche. Modelling Foundations and Applications, Volume 6138 von Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2010)
D. Cox, und S. Polovina. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 460-463. Berlin, Heidelberg, Springer-Verlag, (Juli 2007)