Respiratory protection: scanning electron microscopy study of mask filters. Research, Society and Development, [S. l.], v. 11, n. 5, p. e4011527047, 2022. DOI: 10.33448/rsd-v11i5.27047. Disponível em: https://rsdjournal.org/rsd/article/view/27047. Acesso em: 5 dec. 2025.