1. J.B. MacQueen, Some methods for classification and analysis of multivariate observations, In: Proceedings of 5th Berkeley Symposium on Mathematical Statistics and Probability, 1967, pp. 281–297.
2. Least squares quantization in PCM;Lloyd;IEEE Trans. Inform. Theor.,1982
3. Algorithms for Fuzzy Clustering;Miyamoto,2008
4. Fuzzy sets;Zadeh;Inform. Control,1965
5. Fuzzy Sets and Systems;Dubois,1988