LUDVIGSEN, C. Energy Measurements of Speech Sounds. Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 5, p. 153–162, 1971. DOI: 10.7146/aripuc.v5i.130893. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/130893. Acesso em: 4 may. 2024.