D. Jakobsen, P. Øhrstrøm, und H. Schärfe. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), Volume 6828 von Lecture Notes in Computer Science, Seite 118-130. Springer, (2011)
M. Croitoru, B. Hu, S. Dasmahapatra, P. Lewis, D. Dupplaw, und L. Xiao. Proceedings of the 15th International Conference on Conceptual Structures (ICCS 2007), Volume 4604 von Lecture Notes in Artificial Intelligence, Seite 154-165. Berlin, Heidelberg, Springer-Verlag, (Juli 2007)