WANG, L.; YANG, B. New upper estimate for positive solutions to a second order boundary value problem with a parameter. CUBO, A Mathematical Journal, [S. l.], p. 121–137, 2023. DOI: 10.56754/0719-0646.2501.121. Disponível em: https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/3339. Acesso em: 7 may. 2024.