SHARMA, A.; SINGH, T. P. Feasibility of sputum testing for detection of COVID-19. International Journal of Research in Medical Sciences, [S. l.], v. 9, n. 5, p. 1494–1497, 2021. DOI: 10.18203/2320-6012.ijrms20211892. Disponível em: https://www.msjonline.org/index.php/ijrms/article/view/9347. Acesso em: 14 oct. 2025.