TRYNKOWSKA, Danuta; MICHALSKI, Ryszard. Relation of ear protector attenuation to noise spectra and methods for its determination. Archives of Acoustics, [S. l.], v. 4, n. 3, p. 205–219, 2016. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3378. Acesso em: 21 may. 2025.