KHIRALLAH, Mustafa.Q.; HAFIZ, M.A. EXTENSION OF HOMOTOPY PERTURBATION METHOD FOR SOLVING NONLINEAR SYSTEMS. European Scientific Journal, ESJ, [S. l.], v. 9, n. 12, 2013. DOI: 10.19044/esj.2013.v9n12p%p. Disponível em: https://last.eujournal.org/index.php/esj/article/view/1007. Acesso em: 12 feb. 2026.