1. Medical Ultrasonics;Herrick;Proceedings of the Institute of Radio Engineers,1959
2. Present and future application of ultrasonics in biomedicine;Fry;Proceedings of the Institute of Radio Engineers,1962
3. Ultrasonic rays in medical diagnosis a survey;Gordon;Medical electronics and biological engineering,1963
4. Visualization of the excised human heart by means of reflected ultrasound or ecgography;Wild;American Heart J.,1957
5. The present aspect of the artificial internal organs;Kimoto;Japanese J. of Medical Electronics and Biological Engineering,1963