ODDA , S. Positive solutions of a singular 4th order two-point boundary value problem. Journal of Qassim University for Science, [S. l.], v. 9, n. 2, p. 123–134, 2016. Disponível em: https://jnsm.qu.edu.sa/index.php/jnm/article/view/1804. Acesso em: 20 sep. 2024.