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2. Cytologic intragastric brushing under direct vision; a new gastric brush;Christopher;Gastrointest Endosc,1969
3. Fine needle aspiration and endoscopic brush cytology. Comparison of direct smears and rinsings;Smith;Acta Cytol,1980
4. Diagnostic Cytology by Membrane filter (Application Bulletin No. 100);Kini,1978
5. Exfolialive cytology in gastric ulcer; its role in the differentiation of benign and malignantulcers;Prolla;Gastroenterology,1972