E. LE CLEZIO, T. DELAUNAY, M. LAM, and G. FEUILLARD, “Piezoelectric material characterization by acoustic methods”, Arch. Acoust., vol. 33, no. 4, pp. 603–608, Jan. 2008, Accessed: Jan. 18, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/557