ADLINGTON, J.; ROZSYPAL, A. Periodicity perturbation in natural English vowels. Canadian Acoustics, [S. l.], v. 16, n. 1, p. 17–23, 1988. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/585. Acesso em: 21 feb. 2025.