Volume 20, Issue 2 Xiaomei Dong Deyu Wu Quadratic numerical radius inequalities for the off-diagonal parts of 2⨉2 operator matrices 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 Xiaomei Dong Deyu Wu Find more articles with the same keywords operator matrices quadratic numerical range quadratic numerical radius inequalities Find more articles with the same subject classes 47A12 47A30