NIEMAS, M.; SADOWSKI, J.; ENGEL, Z. Acoustic issues of sacral structures. Archives of Acoustics, [S. l.], v. 23, n. 1, p. 87–104, 2014. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/895. Acesso em: 25 apr. 2025.