A. Dattolo, and F. Luccio. Proceedings of International Conference on Web Information Systems and Technologies - Webist 2008, Funchal, Madeira, Portugal, (May 2008)
S. Strahringer, R. Wille, and U. Wille. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), volume 2120 of Lecture Notes in Computer Science, page 169-186. Springer, (2001)
P. Hitzler, and G. Zhang. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of Lecture Notes in Computer Science, page 170-185. Springer, (2004)
J. Goguen. Proceedings of the 13th International Conference on Conceptual Structures (ICCS 2005), volume 3596 of Lecture Notes in Computer Science, page 52-77. Springer, (2005)