TAWFIQ, Luma. N. M.; HUSSEIN, Reem. W. On Solution of Regular Singular Initial Value Problems. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 26, n. 2, p. 257–264, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/474.. Acesso em: 24 nov. 2024.