On Positive Solutions for Semilinear Elliptic Equations with an Indefinite Nonlinearity Via Bifurcation. Journal of Partial Differential Equations, [S. l.], v. 13, n. 2, p. 133–150, 2000. Disponível em: https://global-sci.com/index.php/jpde/article/view/3938. Acesso em: 5 dec. 2025.