LUDVIGSEN, C. An Attempt to Register Lip Pressure and Lip Rounding by means of the Electro-Glottograph . Annual Report of the Institute of Phonetics University of Copenhagen, [S. l.], v. 4, p. 1–7, 1970. DOI: 10.7146/aripuc.v4i.130775. Disponível em: https://tidsskrift.dk/ARIPUC/article/view/130775. Acesso em: 3 may. 2024.