PLEBAN, Dariusz. Method of Testing of Sound Absorption Properties of Materials Intended for Ultrasonic Noise Protection. Archives of Acoustics, [S. l.], v. 38, n. 2, p. 191–195, 2013. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/32. Acesso em: 26 apr. 2025.