1. History of gastroenterology;Clark,1969
2. Surgical Instruments in Greece and Roman Times;Miline,1907
3. Surgical Instruments in Greece and Roman Times;Desmormeaux,1907
4. Instruments for use through cylindrical specula with the patient in the knee chest position;Kelly;Ann Surg,1903
5. Demonstration of a new gastroscopy, the fiberscope;Hirschowitz;Gastroenterology,1958