UDDIN, M Alhaz; SATTAR, MA. Approximate Solution of a Fourth Order Weakly Non-Linear Differential System with Strong Damping and Slowly Varying Coefficients by Unified KBM Method. Journal of Bangladesh Academy of Sciences, [S. l.], v. 34, n. 1, p. 71–82, 2010. DOI: 10.3329/jbas.v34i1.5493. Disponível em: https://banglajol.info/index.php/JBAS/article/view/5493. Acesso em: 15 oct. 2025.