P. Wojtinnek, B. Harrington, S. Rudolph, und S. Pulman. Proceedings of the 18th International Conference on Conceptual Structures (ICCS 2010), Volume 6208 von Lecture Notes in Computer Science, Seite 203-206. Springer, (2010)
P. Martin, M. Blumenstein, und P. Deer. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), Volume 3596 von Lecture Notes in Computer Science, Seite 411-424. Springer, (2005)