ZHANG, Z.; RAVEENDRA, S. Eigenfrequency extraction based on boundary element method. Canadian Acoustics, [S. l.], v. 29, n. 3, p. 30–31, 2001. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1373. Acesso em: 28 mar. 2024.