Nontrivial Solutions for Some Semilinear Elliptic Equations with Critical Sobolev Exponents. Journal of Partial Differential Equations, [S. l.], v. 4, n. 1, p. 77–96, 1991. Disponível em: https://global-sci.com/jpde/article/view/3675. Acesso em: 4 mar. 2026.