H. SHIMADA, M. TAKAHASJI, S. KATAGIRI, H. KOBAYASHI, and K. SAITO, “Clinical applications of fetal echocardiography”, Arch. Acoust., vol. 9, no. 1-2, pp. 285–295, Jun. 1984, Accessed: Mar. 04, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3225