O’KEEFE, J. Acoustic conditions in and propagating from orchestra pits. Canadian Acoustics, [S. l.], v. 22, n. 3, p. 55–56, 1994. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/847. Acesso em: 3 dec. 2021.