NOWICKI, A., REID, J.M. and SPENCER, M.P. (1984) “Ultrasonic Doppler MTI system for evaluation of aortocoronary bypass graft patency”, Archives of Acoustics, 9(1-2), pp. 243–250. Available at: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3220 (Accessed: 4 March 2026).