A. Cal\`ı, G. Gottlob, и T. Lukasiewicz. Proceedings of the 12th International Conference on Database Theory, стр. 14--30. New York, NY, USA, ACM, (2009)
S. Schenk. KI 2007: Advances in Artificial Intelligence, том 4667 из Lecture Notes in Computer Science, стр. 160--174. Springer Berlin / Heidelberg, (2007)
G. Stumme. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), том 3127 из Lecture Notes in Computer Science, стр. 109-125. Springer, (2004)
G. Stumme. Conceptual Structures at Work: 12th International Conference on Conceptual Structures (ICCS 2004), том 3127 из LNCS, стр. 109-125. Heidelberg, Springer, (2004)
G. Stumme. Conceptual Structures at Work: 12th International Conference on Conceptual Structures (ICCS 2004), том 3127 из LNCS, стр. 109-125. Heidelberg, Springer, (2004)