1. Peptic ulcer: a guide to the practicing physician,1981
2. The problem of peptic ulcer;Ivy;JAMA,1946
3. Pepticulcer in Massachusetts physicians;Monson;N Engl J Med,1969
4. Cimetidine and peptic ulcer disease;Fineberg,1980
5. Cost of ulcer disease in the United States;Von,1977