1. Pulsed ultrasonic flowmeter;Baker,1966
2. Pulsed ultrasonic Doppler blood flow sensing;Baker;IEEE Trans. SU-17,1970
3. Ultrasonic Duplex echo-Doppler scanner;Barber;IEEE Trans. Biomed. Engng,1974
4. Direction resolving Doppler instrument with improved rejection of tissue artefacts;Cross;J. Physiol. Lond.,1971
5. Ein Beitrag zur Blutgeschwindigkeitsmessung unter Anwendung des Doppler effektes;Fahrbach;Electromed.,1970