P. KIEŁCZYŃSKI, “Finite element method (FEM) and impulse response method (IRM) analysis of circular ultrasonic transducers”, Arch. Acoust., vol. 23, no. 2, pp. 291–306, Jun. 1998, Accessed: Mar. 04, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/913