D‘ALESSANDRO, Paolo. Closure of pointed cones and maximum principle in Hilbert spaces. CUBO, A Mathematical Journal, [S. l.], v. 13, n. 2, p. 73–84, 2011. DOI: 10.4067/S0719-06462011000200004. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1372. Acesso em: 3 nov. 2025.