THORSEN, N. A simplified explanation, in physical terms, of the acoustical consequences of tongue and lip movement in vowel production. Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 12, p. 1–15, 1978. DOI: 10.7146/aripuc.v12i.131690. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/131690. Acesso em: 21 may. 2024.