RANACHOWSKI, Z.; RANACHOWSKI, P. Classification of acoustic emission signals registered during the foam drainage process. Archives of Acoustics, [S. l.], v. 22, n. 1, p. 85–92, 1997. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/939. Acesso em: 18 apr. 2026.