1. Ashrafzadeh AR. A dual-pulsed Doppler ultrasound and its applications in determining turbulent blood flow characteristics. Ph D Dissertation, University of Oklahoma, October 1985.
2. Analysis of velocity estimation error for a multidimensional Doppler ultrasound system;Ashrafzadeh;IEEE Trans UFFC,1988
3. Ashrafzadeh AR, Dormer KJ, Cheung JY. A two-dimensional Doppler ultrasonic probe for flow measurement. Biomed Instrum Tech 1989; 301–307.
4. Banjanin ZB, Kim J. Quantitative color flow. US Patent No. 5,1995;443:071.
5. Banjanin ZB, Shahmirian V. Angle independent Doppler in ultrasound imaging. US Patent No. 5,1995;454:372.