1. Modern endoscopy of the alimentary tract;Wolff,1974
2. Present status of gastroscopy and esophagoscopy;Sullivan;Nebr State Med J,1970
3. Endoscopic photography, biopsy and cytology of the esophagus and stomach with the Olympus fiberesophagoscope;Bautista;Gastroenterology,1971
4. Early endoscopy;Sugawa;Arch Surg,1973