S. Bloehdorn, O. Görlitz, S. Schenk, и M. Völkel. Proceedings of the 6th International Conference on Knowledge Management (I-KNOW 06), Graz, Austria, (Сентябрь 2006)
S. Ferré, и O. Ridoux. Proceedings of the 9th International Conference on Conceptual Structures, том 2120 из Lecture Notes in Artificial Intelligence, стр. 187-201. Springer, (2001)
D. Gifford, P. Jouvelot, M. Sheldon, и J. O'Toole. Proceedings of the 13th ACM Symposium on Operating Systems Principles, 25, стр. 16-25. Pacific Grove, California, United States, ACM Press, (1991)