ABDELKARIM, Adel A. Near-Legendre Differential Equations. Journal of Kufa for Mathematics and Computer, Kufa, Najaf, IRAQ, v. 5, n. 3, p. 17–26, 2019. DOI: 10.31642/JoKMC/2018/050303. Disponível em: https://journal.uokufa.edu.iq/index.php/jkmc/article/view/2084. Acesso em: 5 aug. 2026.