HOLTSE, P. Spectrographic Analysis of English Vowels . Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 6, p. 1–48, 1972. DOI: 10.7146/aripuc.v6i.130907. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/130907. Acesso em: 5 may. 2024.