JESSEN, Michael; KOSTER, Olaf; GFROERER, Stefan. Influence of vocal effort on average and variability of fundamental frequency. International Journal of Speech, Language and the Law, [S. l.], v. 12, n. 2, p. 174–213, 2005. DOI: 10.1558/sll.2005.12.2.174. Disponível em: https://journal.equinoxpub.com/IJSLL/article/view/6276. Acesso em: 10 apr. 2025.