KACPROWSKI, Janusz. 4-TH International conference on "environmental protection in Mechanical Engineering". Archives of Acoustics, [S. l.], v. 3, n. 4, p. 293–295, 1978. Disponível em: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3464. Acesso em: 4 mar. 2026.