BERRY, J.; NICOLAS, J. Efficiency of a sound barrier in the presence of surfaces of different impedances. Canadian Acoustics, [S. l.], v. 13, n. 3, p. 40–53, 1985. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/548. Acesso em: 27 jun. 2022.