A Reliable Technique for Solving Gas Dynamic Equation using Natural Homotopy Perturbation Method. Global Journal of Science Frontier Research, [S. l.], v. 17, n. F6, p. 49–55, 2017. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/2123. Acesso em: 20 feb. 2026.