Mohand-Said Hacid, Zbigniew W. Ras, Djamel A. Zighed, Yves Kodratoff: Foundations of Intelligent Systems, 13th International Symposium, ISMIS 2002, Lyon, France, June 27-29, 2002, Proceedings. Lecture Notes in Computer Science 2366, Springer 2002, ISBN 3-540-43785-1