MOULAHARABBI, Somayya; BARRAA, Mohamed. The S-spectrum of combinations of idempotents on two-sided quaternionic Banach algebra. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 11, p. 699–700, 2025. DOI: 10.3842/umzh.v77i11.8410. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8410. Acesso em: 5 dec. 2025.