GARBOUJ, Zied; SKHIRI, Haïkel. On a new class of operators related to quasi-Fredholm operators. Methods of Functional Analysis and Topology, [S. l.], v. 26, n. 2, p. 141–166, 2020. DOI: https://doi.org/10.31392/MFAT-npu26_2.2020.06. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/754. Acesso em: 16 dec. 2025.