KACZKOWSKI, Zbigniew. International congress on ultrasonics (ICU–90). Archives of Acoustics, [S. l.], v. 16, n. 1, p. 190–191, 1991. Disponível em: https://acoustics.ippt.gov.pl/index.php/aa/article/view/4211. Acesso em: 4 mar. 2026.