Fuzzy Stability of a General Quadratic Functional Equation. - Sun Sook Jin; Yang-Hi Lee (Adv. Fuzzy Syst., 2011)

Fuzzy Stability of a Quadratic-Additive Functional Equation. - Sun Sook Jin; Yang-Hi Lee (Int. J. Math. Math. Sci., 2011)

A Fixed Point Approach to the Stability of the Cauchy Additive and Quadratic Type Functional Equation. - Sun Sook Jin; Yang-Hi Lee (J. Appl. Math., 2011)