Fuzzy Lipschitz maps and fixed point theorems in fuzzy metric spaces. - Gabjin Yun; Seungsu Hwang; Jeongwook Chang (Fuzzy Sets Syst., 2010)

On a Generalized Hyers-Ulam Stability of Trigonometric Functional Equations. - Jaeyoung Chung; Jeongwook Chang (J. Appl. Math., 2012)