BANDERA, W.; PAWLACZYK, K. Sound velocity and loss factor of polyurethane composites. Part II. Archives of Acoustics, [S. l.], v. 16, n. 3-4, p. 451–460, 1991. Disponível em: https://acoustics.ippt.gov.pl/index.php/aa/article/view/1241. Acesso em: 4 mar. 2026.