HE, J.-H. Recent development of the homotopy perturbation method. Topological Methods in Nonlinear Analysis, [S. l.], v. 31, n. 2, p. 205–209, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.011. Acesso em: 22 jul. 2024.