1. See for example P. Atkinson and J. P. Woodcock, “Doppler ultrasound and its use in clinical measurements”, Academic Press, London, 1982.
2. P. M. Embree and W. D. O’Brien Jr., “The accurate ultrasonic measurement of the volume of blood by time domain correlation”, Proc. IEEE Ultrasonics Symposium, pp 963–966, 1985
3. O. Bonnefous, P. Pesque and X. Bernard, “A new velocity Estimator for color flow mapping”, Proc. IEEE Ultrasonics Symposium, pp 855–860, 1986.
4. M. Nikoonahad and F. Li, “High resolution ultrasound transverse flow measurement”, Electron. Lett., 24(4), pp 205–207, 1988.
5. M. Nikoonahad, “Differential phase contrast acoustic microscopy using tilted transducers”, Electron. Lett., 23(10), pp 489–490, 1987.