WANG, Weihui; YANG, Zuodong. Nonnegative solutions of quasilinear elliptic problems with sublinear indefinite nonlinearity. CUBO, A Mathematical Journal, [S. l.], v. 15, n. 2, p. 21–31, 2013. DOI: 10.4067/S0719-06462013000200002. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1306. Acesso em: 3 nov. 2025.