The Obstacle Problems for Second Order Fully Nonlinear Elliptic Equations with Neumann Boundary Conditions. Journal of Partial Differential Equations, [S. l.], v. 5, n. 3, p. 33–45, 1992. Disponível em: https://global-sci.com/index.php/jpde/article/view/3717. Acesso em: 5 dec. 2025.