A time-shared ultrasound Doppler measurement and 2-D imaging system. - Kjell Kristoffersen; Bjørn A. J. Angelsen (IEEE Trans. Biomed. Eng., 1988)

Predictive analog to digital conversion of Doppler ultrasound signals. - Svein Boe; Kjell Kristoffersen (IEEE Trans. Biomed. Eng., 1995)