1. Demonstration of a new gastroscope, the “fiberscope”;Hirschowitz;Gastroenterology,1958
2. Description and experiences with flexible fibersigmoidoscopy;Overholt,1970
3. Clinical experience with the fibersigmoidoscope;Overholt;Gastrointest Endosc,1968
4. Flexible fiberoptic sigmoidoscopes;Overholt;CA Cancer Clin,1969
5. Clinical study of colono-fiberscope;Niwa;Gastrointest Endosc,1969