Volume 14, Issue 2 Inho Hwang Choonkil Park Ulam stability of an additive-quadratic functional equation in Banach spaces Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Inho Hwang Choonkil Park Find more articles with the same keywords Hyers-Ulam stability fixed point method additive-quadratic functional equation direct method Find more articles with the same subject classes 39B52 47H10 39B62