ENGEL, Zbigniew. Proceedings of the Conference on Noise Suppression NOISE CONTROL 85. Archives of Acoustics, [S. l.], v. 10, n. 4, p. 317–318, 1985. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/3166. Acesso em: 18 apr. 2026.