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://gsp.tricubic.dev/jpde/article/view/3717. Acesso em: 15 mar. 2026.