BEHAR, A.; DESORMEAUX, J. NRR, ABC OR… [hearing protector selection]. Canadian Acoustics, [S. l.], v. 22, n. 1, p. 27–30, 1994. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/826. Acesso em: 3 dec. 2021.