1. Direct vision biopsy and cytology;Hayashi;Gastroenterol Endosc (Japanese),1966
2. Gastric biopsy under direct vision by fibergastroscope;Kasugai;Gastrointestinal Endoscopy,1968
3. Exfoliative cytology in gastric ulcer; its role in the differentiation of benign and malignant ulcers;Prolla;Gastroenterology,1972
4. Gastroscopy and photography are not enough; the importance of cytologic and histologic diagnosis in gastric ulcer;Wenger;Am J Gastroenterol,1972
5. Endoscopic diagnosis of duodenal neoplasms;Maimon;John Hopkins Med J,1973