1. Ultrasonics in obstetrics;Donald;British Medical Bulletin,1968
2. Further advances in ultrasonic diagnosis;Donald;Ultrasonics,1967
3. Direct contact ultrasonic scanning techniques for the visualization of abdominal masses;Brown,1959
4. On the diagnostic value of ultrasound in obstetrics and gynaecology;Sunden;Acta Obstetrica och Gynecologia Scandinavica,1964
5. Ultrasonic contact scanner for diagnostic application;Holmes;American Journal of Medical Electronics,1965