JØRGENSEN, H. P. Acoustic Analysis of Tense and Lax Vowels in German. Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 1, p. 77–84, 1967. DOI: 10.7146/aripuc.v1i.130580. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/130580. Acesso em: 2 may. 2024.