LEITMANN, G. A Direct Method of Optimization and its Application to a Class of Differential Games. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 3, p. 216–225, 2003. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1673. Acesso em: 20 may. 2024.