Generalized Estimation of Numerical Radius for the off-Diagonal 2×2 Operator Matrices and Its Application. Journal of Mathematical Study, [S. l.], v. 58, n. 3, p. 323–337, 2025. DOI: 10.4208/jms.v58n3.25.05. Disponível em: https://global-sci.com/index.php/jms/article/view/23020. Acesso em: 5 dec. 2025.