1. Personal communications;Camps, F.E.,1960
2. Doll, R., and Jones, F. Avery (1951). Spec. Rep. Ser. med. Res. Coun.
3. The special significance of concomitant gastric and duodenal ulcers;Johnson, H.D.;Lancet,1955
4. The classification and principle of treatment of gastric ulcers;Johnson, H.D.;Ibid,1957
5. Surgical Aspects of Medicine;Johnson, H.D.,1959