ROUT, N.; PAUL, S.; WAGHMARE, P.; PATNAIK, R. Low cost multi-use hearing aid. Bangladesh Journal of Otorhinolaryngology, [S. l.], v. 18, n. 1, p. 36–41, 2012. DOI: 10.3329/bjo.v18i1.10412. Disponível em: https://banglajol.info/index.php/BJO/article/view/10412. Acesso em: 9 dec. 2021.