Optimality and Duality for Nondifferentiable Multiobjective Variational Problems with Higher Order Derivatives. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 2, n. 3, p. 372–400, 2009. Disponível em: https://ejpam.com/index.php/ejpam/article/view/180.. Acesso em: 3 may. 2024.