GRUBER, J.; BHULLAR, J.; WILLIAMS, G. Electro-Acoustic Factors Determining Telephone Speech Quality. Canadian Acoustics, [S. l.], v. 10, n. 2, p. 29–39, 1982. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/483. Acesso em: 22 jul. 2024.