DRAGOMIR, S. S.; BOLDEA, M. V.; MEGAN, M. Inequalities for Chebyshev functional in Banach algebras. CUBO, A Mathematical Journal, [S. l.], v. 19, n. 1, p. 53–77, 2017. DOI: 10.4067/S0719-06462017000100004. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1143. Acesso em: 11 oct. 2025.