W. RDZANEK, “Directional characteristic of a circular membrane vibrating under the effect of a force with uniform surface distribution”, Arch. Acoust., vol. 10, no. 2, pp. 179–190, Jul. 2015, Accessed: Jun. 11, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3143