BEHAR, A. Attenuations from hearing protectors and the ABC classification system. Canadian Acoustics, [S. l.], v. 19, n. 5, p. 17–22, 1991. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/701. Acesso em: 23 apr. 2024.