FRØKJÆR-JENSEN, B. A Photo-Electric Glottograph . Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 2, p. 5–19, 1968. DOI: 10.7146/aripuc.v2i.130672. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/130672. Acesso em: 4 may. 2024.