T. POWAŁOWSKI, “An ultrasonic C.W. doppler method of measurement of the blood flow velocity”, Arch. Acoust., vol. 6, no. 3, pp. 287–306, Mar. 2016, Accessed: Apr. 26, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3314