1. Fuzzy sets;Zadeh;Information and Control,1965
2. Fuzzy Modeling and Genetic Algorithms for Data Mining and Exploration;Cox,2005
3. Validity index for crisp and fuzzy clusters;Pakhira;Pattern Recognition,2004
4. Cluster validity with fuzzy sets;Bezdek;Journal of Cybernetics,1974
5. On fuzzy cluster validity indices;Wang;Fuzzy Sets and Systems,2007