SIROVNIK, Nejc. On certain functional equation in semiprime rings and standard operator algebras. CUBO, A Mathematical Journal, [S. l.], v. 16, n. 1, p. 73–80, 2014. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1289. Acesso em: 2 nov. 2025.