HUTTERS, B. Problems in the use of the photo-electric glottograph. Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 10, p. 275–312, 1976. DOI: 10.7146/aripuc.v10i.131139. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/131139. Acesso em: 3 may. 2024.