dos Santos, Lucelina Batista, Marko Antonio Rojas-Medar, e Valeriano Antunes de Oliveira. 2012. “Saddle Point and Second Order Optimality in Nondifferentiable Nonlinear Abstract Multiobjective Optimization”. Trends in Computational and Applied Mathematics 13 (2):179-91. https://doi.org/10.5540/tema.2012.013.02.0179.