1. Demonstration of a new gastroscope, the “fiberscope”;Hirschowitz;Gastroenterology,1958
2. Pyloroduodenal ulcer: endoscopic aspects. Gastroint Endosc 12:34;Belber,1965
3. Endoscopic evaluation of duodenal bulb deformities and their relation to duodenal ulcer;Belber;Gastroint Endosc,1967
4. Intraduodenal cinematography in normal and pathologic duodenal bulbs;Belber;Gastroint Endosc,1969
5. Duodenal bulb visualization with the Hirschowitz gastroduodenal fiberscope and the Hirschowitz gastroduodenal fiberscope with deflecting tip: a comparative study;Belber;Gastroint Endosc,1970