Natural Generalized Inverse and Core of an Element in Semi- groups, Rings and Banach and Operator Algebras. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 5, n. 2, p. 160–173, 2012. Disponível em: https://ejpam.com/index.php/ejpam/article/view/1599.. Acesso em: 3 may. 2024.