On the Existence and Regularity of Nontrivial Solution in W1,p for Quasilinear Elliptic Equtions. Journal of Partial Differential Equations, [S. l.], v. 2, n. 2, p. 65–75, 1989. Disponível em: https://global-sci.com/index.php/jpde/article/view/3619. Acesso em: 27 feb. 2026.