GANJI, Z. Z.; GANJI, D. D.; JAFARI, H.; ROSTAMIAN, M. Application of the homotopy perturbation method to coupled system of partial differential equations with time fractional derivatives. Topological Methods in Nonlinear Analysis, [S. l.], v. 31, n. 2, p. 341–348, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.025. Acesso em: 16 oct. 2021.