On the stability of generalized additive functional inequalities in Banach spaces. Lee, Jung Rye; Park, Choonkil; Shin, Dong Yun — 2008 Journal of Inequalities and Applications [electronic only]
Fuzzy stability of quadratic functional equations. Lee, Jung Rye; Jang, Sun-Young; Park, Choonkil; Shin, Dong Yun — 2010 Advances in Difference Equations [electronic only]
Fuzzy stability of Jensen-type quadratic functional equations. Jang, Sun-Young; Lee, Jung Rye; Park, Choonkil; Shin, Dong Yun — 2009 Abstract and Applied Analysis