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2. P. J. Fish, “Multichannel Direction Resolving Doppler Angiography”, Abstract of 2nd European Cong, on Ultras, in Med., 72 (1975).
3. M. Brandestini, “Topflow—A Digital Full Range Doppler Velocity Meter”, IEEE Trans. SU-25, No. 5, 287– 293 (1978).
4. P. A. Grandchamp, “A Novel Pulsed Directional Doppler Veloci- meter, the Phase-detection Profilometer”, Proc. of 2nd Europ. Cong, on Ultras, in Med., 122–132 (1975).
5. M. Brandestini, “Application of the Phase Detection Principle in Transcutaneous Velocity Profile Meter”, ibid 144 (1975).