REFERENCES
- Boros, E.: Esophagoscopy by means of a flexible instrument: New esophagogastroscope. Gastroenterology 8:427 (June) 1947.
- Hufford, A. R.: Flexi-rigid, optical esophagoscope. Gastroenterology 12:779 (May) 1949.
- Schindler, R.: Safe diagnostic optical esophago-scope. J.A.M.A. 138:885 (November 28) 1948.
- Selesnick, S.: Pharyngeal anesthesia for gastroscopy and esophagoscopy: A new simplified technique. Gastroenterology 17:515 (April) 1951.
- Seybold, W. D., Johnson, M. A., III and Leary, W. V.: Perforation of esophagus; analysis of 50 cases and account of experimental studies. S. Clin. North America 30:1155 (August) 1950.
- Palmer, E. D.: Risks of peroral endoscopy. U. S. Armed Forces M. J. 5:974 (July) 1954.
- Friedman, E. and Katz, O.: Early endoscopy in acute upper gastrointestinal hemorrhage. (To be published.)