Comparison of zero crossing counter to FFT spectrum of ultrasound Doppler. - Gerard L. Cote; Martin D. Fox (IEEE Trans. Biomed. Eng., 1988)

Fast Hartley transforms for spectral analysis of ultrasound Doppler signals. - Chul Hwa Paik; Gerard L. Cote; John S. DePonte; Martin D. Fox (IEEE Trans. Biomed. Eng., 1988)