Foundations of Fuzzy Logic and Soft Computing 12th International Fuzzy Systems Association World Congress, IFSA 2007, Cancun, Mexico, June 18-21, 2007. Proceedings - Melin, Patricia; Castillo, Oscar; Aguilar, Luis T.; Kacprzyk, Janusz; Pedrycz, Witold (Springer Berlin Heidelberg, 2007)