LU, J. Analytical approach to Kawahara equation using variational iteration method and homotopy perturbation method. Topological Methods in Nonlinear Analysis, [S. l.], v. 31, n. 2, p. 287–293, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.020. Acesso em: 22 jul. 2024.