1. Investigations of backscattering in relation to ultrasonic diagnosis;Hill,1972
2. Ultrasonic echo-imaging of tissues: instrumentation;Hill;Brit J Radiol,1976
3. Ultrasonic Tissue Characterization,1976
4. Ultrasonic Tissue Characterization II,1979
5. Orientation and frequency dependence of back-scattered energy and its clinical application;Nicholas,1977