RYAN, J.; SHAW, E.; BRAMMER, A.; ZHANG, G. ENCLOSURE FOR LOW-FREQUENCY ASSESSMENT OF ACTIVE NOISE REDUCING CIRCUMAURAL HEADSETS AND HEARING PROTECTORS. Canadian Acoustics, [S. l.], v. 21, n. 4, p. 19–20, 1993. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/820. Acesso em: 23 apr. 2024.