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2. Prevention of gastroduodenal damage induced by nonsteroidal anti-inflammatory drugs: controlled trial of ranitidine;Ehsanullah, R.S.B.; Page, M.C.; Tildesley, G.; Wood, J.R.;Br Med J
3. Rising frequency of ulcer perforation in elderly people in the United Kingdom;Walt, R.; Katchinski, B.; Logan, R.; Ashley, J.; Langman, M.;Lancet,1986
4. 20 years of hospital admissions for peptic ulcer in England and Wales;Coggon, D.; Lambert, P.; Langman, M.J.S.;Lancet,1981
5. Non-steroidal anti-inflammatory drugs and bleeding peptic ulcer;Somerville, K.; Faulkner, G.; Langman, M.;Lancet,1986