On the Existence and Stability of Positive Solutions for Some Pairs of Differential Equations. Journal of Partial Differential Equations, [S. l.], v. 12, n. 1, p. 41–54, 1999. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/3900. Acesso em: 6 dec. 2025.