REFERENCES
- Sigel, B. et al.: Scientific exhibit. American College of Surgeons clinical congress, October 2–6, 1967.
- Bernstine, R. L. and Callagan, D. A.: Ultrasonic Doppler inspection of the fetal heart. Amer J Obstet Gynec 95:1001–1004 (August 1) 1966.
- Barton, J.: Chicago Gynecological Society meeting, April 21, 1967.
- Strandness, D. E, Jr., Schultz, R. D., Sumner, D. S. and Rushmer, R. F.: Ultrasonic flow detection. A useful technic in the evaluation of peripheral vascular disease. Amer J Surg 113: 311–320 (March) 1967.