WOJDOWSKI, W. Measurements of dispersion of ultrasonic wave velocity in thin layers by the ultrasonic spectroscopy. Archives of Acoustics, [S. l.], v. 17, n. 3, p. 357–374, 1992. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/1194. Acesso em: 18 apr. 2026.