Tajmouati, Abdelaziz, et al. “PSEUDO SEMI B-FREDHOLM AND GENERALIZED DRAZIN INVERTIBLE OPERATORS THROUGH LOCALIZED SVEP”. Italian Journal of Pure and Applied Mathematics, vol. 37, Jan. 2017, pp. 301-14, https://journals.uniurb.it/index.php/ijpam/article/view/6708.