MESSIRDI, S.; DJAA, M.; MESSIRDI, B. Stability of Almost Closed Operators on a Hilbert Space. Sarajevo Journal of Mathematics, [S. l.], v. 5, n. 1, p. 133–141, 2024. DOI: 10.5644/SJM.05.1.12. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/358. Acesso em: 15 oct. 2024.