BIRNIE, S. A Comparison of the Annoyance Reduction Effect of Different Shielding Types. Canadian Acoustics, [S. l.], v. 6, n. 1, p. 6–15, 1978. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/410. Acesso em: 5 dec. 2021.