KHDIR, A. A New Modification of The HPM for The Duffing Equation With High Nonlinearity. JOURNAL OF ADVANCES IN PHYSICS, [S. l.], v. 2, n. 2, p. 124–133, 2013. DOI: 10.24297/jap.v2i2.2099. Disponível em: https://rajpub.com/index.php/jap/article/view/497. Acesso em: 22 jul. 2024.