LEWIN, P. A., and M. A. SCHAFER. “Wideband Characterization of Ultrasound Transducers and Materials Using Time Delay Spectrometry”. Archives of Acoustics 17, no. 1 (March 31, 1992): 103–115. Accessed March 4, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/1175.