PANIGRAHI, S.; ROUT, S. Existence of positive solutions for a nonlinear semipositone boundary value problems on a time scale. CUBO, A Mathematical Journal, [S. l.], v. 24, n. 3, p. 413–437, 2022. DOI: 10.56754/0719-0646.2403.0413. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/3207. Acesso em: 20 apr. 2024.