N. Fanizzi, и C. d'Amato. Foundations of Intelligent Systems, 16th International Symposium,, том 4203 из Lecture Notes in Computer Science, стр. 322-331. Springer, Berlin--Heidelberg, Germany, (2006)
C. d'Amato, N. Fanizzi, и F. Esposito. Proceedings of the 2006 ACM Symposium on Applied Computing (SAC 2006), April 23-27, 2006, Dijon, France, стр. 1695--1699. ACM, New York, NY, USA, (2006)