Natural Generalized Inverse and Core of an Element in Semigroups, Rings and Banach and Operator algebras. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 6, n. 4, p. 413–427, 2017. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/1528.. Acesso em: 14 jun. 2024.