On the Existence of Positive Solutions for a Class of Semilinear Elliptic Systems. Journal of Partial Differential Equations, [S. l.], v. 10, n. 3, p. 193–212, 1997. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3855. Acesso em: 6 dec. 2025.