FATTORINI, H. O. Sufficiency of the maximum principle for time optimality. CUBO, A Mathematical Journal, [S. l.], v. 7, n. 3, p. 27–37, 2005. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1533. Acesso em: 15 mar. 2026.