P. Øhrstrøm, U. Sandborg-Petersen, S. Thorvaldsen, и T. Ploug. Proceedings of the 21th International Conference on Conceptual Structures (ICCS 2013), том 7735 из Lecture Notes in Computer Science, стр. 31-43. Springer, (2013)
H. Schärfe, U. Petersen, и P. Øhrstrøm. Proceedings of the 10th International Conference on Conceptual Structures (ICCS 2002), том 2393 из Lecture Notes in Computer Science, стр. 285-298. Springer, (2002)