1. Bronchitis, aspirin, smoking, and other factors in the aetiology of peptic ulcer;Allibone, A.; Flint, F.J.;Lancet,1958
2. Gastrointestinal haemorrhage and salicylates;Alvarez, A.S.; Summerskill, W.H.J.;Ibid,1958
3. Bleeding peptic ulcer. Guy's Hosp;Baker, C.;Rep,1947
4. Seasonal incidence and precipitating causes of hemorrhage from peptic ulcer;Boles, R.S.; Westerman, M.P.;J. Amer. med. Ass,1954
5. Bleeding peptic ulcer: seasonal variation;Breen, F.J.; Grace, W.J.;Amer. J. dig. Dis,1962