1. Doppler Ultrasound, Physics, Instrumentation, and Signal Processing;Evans,2000
2. Arterial Imaging – Modern and Developing Technology;Cavaye,1993
3. R.L. Powis, W.J. Powis, A Thinker’s Guide to Ultrasonic Imaging, Urban and Schwarzenberg, 1984.
4. Physics and Instrumentation of Diagnostic Medical Ultrasound;Fish,1990
5. Quadrature-to-directional format conversion of Doppler signals using digital methods;Adyin;Physiol. Meas.,1994