1. Morbidity and mortality in standard and flexible gastrointestinal endoscopy;Katz;Gastrointestinal Endoscopy,1969
2. Gastrointestinal fiberendoscopy;Gaisford;Am J Surg,1972
3. The hazards of digestive fibre-endoscopy; A survey of British experience;Schiller;Gut,1972
4. Endoscopic experience in 100 consecutive cases with the Olympus GIF endoscope;Papp;Am J Gastroenterol,1973
5. Colonoscopy. A study of 50 cases;Hansen;Scand J Gastroenterol,1971