CHENG, M.; HODGSON, M.; BASKERVILLE, O. Evaluation and Improvement of the Acoustical Performance of Vented Earplugs. Canadian Acoustics, [S. l.], v. 24, n. 3, p. 72–72, 1996. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1043. Acesso em: 19 oct. 2021.