Modification of Noise Reduction by SiO2 Nanocomposite: The Case of Earplugs. Romanian Journal of Acoustics and Vibration, [S. l.], v. 19, n. 2, p. 70–74, 2023. Disponível em: https://rjav.sra.ro/index.php/rjav/article/view/264.. Acesso em: 16 feb. 2025.