TAWFIQ, Luma. N. M.; RASHEED, Heba. W. On Solution of Regular Singular Ordinary Boundary Value Problem. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 26, n. 2, p. 249–256, 2017. Disponível em: https://www.jih.uobaghdad.edu.iq/index.php/j/article/view/473. Acesso em: 1 may. 2025.