PIECHOCKI, M., XHAARD, M. and PERONNEAU, P. (1985) “Application of a phase loop system to analysis of a doppler signal in ultrasonic systems”, Archives of Acoustics, 10(3), pp. 273–280. Available at: https://acoustics.ippt.pan.pl/index.php/aa/article/view/3163 (Accessed: 8 April 2026).