KARIM, R.; DEY, P.; MIAH, S. S. Approximate solution of nonlinear differential system with time variation. Journal of Bangladesh Academy of Sciences, [S. l.], v. 44, n. 2, p. 121–130, 2021. DOI: 10.3329/jbas.v44i2.51456. Disponível em: https://banglajol.info/index.php/JBAS/article/view/51456. Acesso em: 17 jul. 2024.