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2. Carcinoid tumors: a report of four cases with unusual sites of origin;Dutt;Med J Malaya,1969
3. Carcinoid of esophagus;Brenner;NY State J Med,1969
4. Gastrointestinal pathology;Morson,1972
5. Three cases of anaplastic carcinoma of the esophagus with reference to ectopic hormone production;Taniguchi,1972