1. Jain, A.K., Dubes, R.C.: Algorithms for Clustering Data. Prentice-Hall, Englewood Cliffs (1988)
2. Bezdek, J.C.: Pattern Recognition with Fuzzy Objective Function Algorithms. Plenum Press, New York (1981)
3. Höppner, F., Klawonn, F., Kruse, R., Runkler, T.A.: Fuzzy Cluster Analysis. John Wiley & Sons, Chichester (1999)
4. Lecture Notes in Computer Science;F. Klawonn,2003
5. Lecture Notes in Artificial Intelligence;F. Klawonn,2006