1. Bezdek, J.C., Keller, J.M., Krishnapuram, R., Pal, N.R.: Fuzzy Models and Algorithms for Pattern Recognition and Image Processing. Kluwer, Norwell (1999)
2. Jain, A., Dubes, R.: Algorithms for Clustering Data. Prentice Hall, Englewood Cliffs (1988)
3. Theodoridis, S., Koutroumbas, K.: Pattern Recognition, 4th edn. Academic Press, NY (2006)
4. Hoppner, F., Klawonn, F., Kruse, R., Runkler, T.: Fuzzy Cluster Analysis. Wiley and Sons, Chichester (1999)
5. Rand, W.M.: Objective criteria for the evaluation of clustering methods. JASA 66(336), 846–850 (1971)