OTHMAN, M. I. A.; ALI, M. G. S.; FAROUK, R. M. Normal Mode Analysis of the Nonlinear Acoustic Wave Equation. Walailak Journal of Science and Technology (WJST), [S. l.], v. 11, n. 4, p. 341–347, 2013. Disponível em: https://wjst.wu.ac.th/index.php/wjst/article/view/366. Acesso em: 27 apr. 2024.