Volume 16, Issue 2 Hongwei Qiao Guojun Hai Eburilitu Bai Some refinements of numerical radius inequalities for 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 Hongwei Qiao Guojun Hai Eburilitu Bai Find more articles with the same keywords numerical radius inequality operator norm operator matrix Find more articles with the same subject classes 47A05 47A12 47A30