Approximation of generalized left derivations. Kang, Sheon-Young; Chang, Ick-Soon — 2008 Abstract and Applied Analysis
On the Hyers-Ulam stability of quadratic functional equations. Chang, Ick-Soon; Kim, Hark-Mahn — 2002 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Functional inequalities associated with additive mappings. Roh, Jaiok; Chang, Ick-Soon — 2008 Abstract and Applied Analysis
On functional inequalities originating from module Jordan left derivations. Kim, Hark-Mahn; Kang, Sheon-Young; Chang, Ick-Soon — 2008 Journal of Inequalities and Applications [electronic only]