ASSMANN, P. F.; NEAREY, T. M. A review of results on frequency shifts and vowel identification. Canadian Acoustics, [S. l.], v. 31, n. 3, p. 18–19, 2003. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1529. Acesso em: 19 apr. 2024.