COPS, A.; LAURIKS, W. Characterization of sound absorbing materials used in noise control engineering. Archives of Acoustics, [S. l.], v. 18, n. 2, p. 209–248, 1993. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/1142. Acesso em: 18 apr. 2026.