On the Existence of Positive Solutions of Quasilinear Elliptic Equations with Mixed Boundary Conditions. Journal of Partial Differential Equations, [S. l.], v. 5, n. 3, p. 61–71, 1992. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3719. Acesso em: 5 dec. 2025.