1. Dynamic ultrasonic scanning as an NDT tool;Crook;NDT International,1986
2. Sonar examination of the abdomen;Donald;Ultrasonics,1966
3. Sonar — the story of an experiment;Donald;Ultrasound in Medicine and Biology,1974
4. Improved displays for ultrasonic testing;Harper;CEGB Digest,1974
5. Detecting gall-stones with ultrasonics;Ludwig;Electronics,1950