OMRAN, S. .; AHMED, A. E.-S. . Numerical radius of operators on Hilbert modules. Journal of Advanced Studies in Topology, [S. l.], v. 7, n. 2, p. 79–83, 2022. Disponível em: http://m-sciences.com/index.php/jast/article/view/199. Acesso em: 26 jan. 2023.