BEHAR, A. Hearing protectors - Calculations of the noise level at the protected ear. Canadian Acoustics, [S. l.], v. 32, n. 1, p. 15–19, 2004. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1579. Acesso em: 30 nov. 2022.