FRØKJÆR-JENSEN, Børge. Comparison between a Fabre Glottograph and a Photo-Electric Glottograph. Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 3, p. 9–16, 1969. DOI: 10.7146/aripuc.v3i.130688. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/130688. Acesso em: 5 dec. 2025.