DEHICI, Abdelkader. On Some Properties of Spectra and Essential Spectra in Banach Spaces. Sarajevo Journal of Mathematics, [S. l.], v. 11, n. 2, p. 219–234, 2024. DOI: 10.5644/SJM.11.2.08. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/212. Acesso em: 18 jan. 2025.