1. [1] J. C. Bezdek and S. K. Pal, Fuzzy Models for Pattern Recognition: Methods That Search for Structures in Data, IEEE Press, 1992, pp. 35-62.
2. [2] D. Dubois and H. Prade, Fuzzy Sets and Systems: Theory and Applications, Society for Industrial and Applied Mathematics, 1980, vol. 144, pp. 12-20.
3. [3] M. G. Voskoglou, "Stochastic and fuzzy models in mathematics education," Artificial Intelligence and Management, 2011.
4. [4] M. G. Voskoglou, "A study on fuzzy systems," Am. J. Comput. Appl. Math., vol. 2, pp. 232-240, 2012.
5. [5] M. G. Voskoglou, "Fuzzy logic and uncertainty in mathematics education," Int. J. Appl. Fuzzy Sets Artif. Intell., vol. 1, pp. 45-64, 2011.