Journal of Mathematical Inequalities · Volume 14, Issue 2 Ulam stability of an additive-quadratic functional equation in Banach spaces 14-27 Pages 421-436 DOI 10.7153/jmi-2020-14-27 Downloads Short PDF Full PDF PNG Authors Inho Hwang Choonkil Park Keywords Hyers-Ulam stability fixed point method additive-quadratic functional equation direct method Subject classes 39B52 47H10 39B62