G. ŁYPACEWICZ and E. DURIASZ, “Design principles of transducers with matching layers based on admittance measurements”, Arch. Acoust., vol. 17, no. 1, pp. 117–132, May 2014, Accessed: Apr. 26, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1176