The stability of a quadratic functional equation with the fixed point alternative. Park, Choonkil; Kim, Ji-Hye — 2009 Abstract and Applied Analysis
A fixed point approach to the stability of an additive-quadratic-cubic-quartic functional equation. Lee, Jung Rye; Kim, Ji-Hye; Park, Choonkil — 2010 Fixed Point Theory and Applications [electronic only]
Fixed points and random stability of a generalized Apollonius type quadratic functional equation. Kim, Min June; Schin, Seung Won; Ki, Dohyeong; Chang, Jaewon; Kim, Ji-Hye — 2011 Fixed Point Theory and Applications [electronic only]