MOUSSAOUI, T.; PRECUP, R. Positive Solutions for Elliptic Boundary Value Problems with a Harnack-Like Property. CUBO, A Mathematical Journal, [S. l.], v. 10, n. 4, p. 109–117, 2008. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1492. Acesso em: 25 apr. 2024.