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2. Endoscopy and routine and doublecontrast barium meal in diagnosis of gastric and duodenal disorders;Rogers, I.M.; Sokhi, G.S.; Moule, B.; Joffe, S.N.; Blumgart, L.H.;Lancet,1976
3. Double-contrast barium meal and upper gastrointestinal endoscopy: a comparative study;Dooley, C.P.; Larson, A.W.; Stace, N.H.;Ann Intern Med,1984
4. Upper gastrointestinal endoscopy-a GP service;Fisher, J.A.; Surridge, J.G.; Vartan, C.P.; Loehry, C.A.;B MedJ,1977
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