General Upper Bounds for the Numerical Radii of Powers of Hilbert Space Operators. The Eurasia Proceedings of Science, Technology, Engineering and Mathematics, [S. l.], v. 22, p. 15–25, 2023. DOI: 10.55549/epstem.1334983. Disponível em: https://www.epstem.net/index.php/epstem/article/view/579. Acesso em: 9 feb. 2026.