Volume 5, Issue 4 Attila Gilányi On a problem by K. Nikodem 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 Attila Gilányi Find more articles with the same keywords square-norm equation functional inequality stability Find more articles with the same subject classes 39B62 39B82