SHAHI, M. Some special characterisations of Fredholm operators in Banach space. BIBECHANA, [S. l.], v. 11, p. 169–174, 2014. DOI: 10.3126/bibechana.v11i0.10399. Disponível em: https://www.nepjol.info/index.php/BIBECHANA/article/view/10399. Acesso em: 4 oct. 2024.