P. A. LEWIN and M. A. SCHAFER, “Wideband characterization of ultrasound transducers and materials using time delay spectrometry”, Arch. Acoust., vol. 17, no. 1, pp. 103–115, May 2014, Accessed: Apr. 26, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1175