Natural Generalized Inverse and Core of an Element in Semi- groups, Rings and Banach and Operator Algebras. Eur. J. Pure Appl. Math. [Internet]. 2012 May 14 [cited 2024 Nov. 21];5(2):160-73. Available from: https://www.ejpam.com/index.php/ejpam/article/view/1599