PERMIN, Henrik; NORN, Svend. Stethoscope - Over 200 years. Journal of Pulmonology and Respiratory Research, [S. l.], v. 3, n. 1, p. 001–008, 2019. DOI: 10.29328/journal.jprr.1001010. Disponível em: https://www.pulmonolrespirjournal.com/jprr/article/view/jprr-aid1010. Acesso em: 10 oct. 2025.