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3. Studies on the Changing Incidence of Peptic Ulcer of the Stomach;Alsted, G.,1939
4. The histological background to gastric ulcer;Ball, P.A.J.; James, A.H.;Lancet,1961
5. Observations from New South Wales on the changing incidence of gastric ulcer in Australia;Billington, B.P.;Gut,1965