REFERENCES
- Alsted, G. The Incidence of Peptic Ulcer in Denmark. Danish Science Press, Copenhagen, 1953.
- Bager, R. Acta chir. scand. 1929, Suppl. XI.
- Billington, B. P. Gut 1965, 6, 121–133.
- Bonnevie, O. The incidence of duodenal ulcer in Copenhagen County. To be published.
- Bonnevie, O. The incidence of coexisting gastric and duodenal ulcer in Copenhagen County. To be published.
- Bonnevie, O. Gastric and duodenal ulcers in the same patient. To be published.
- Bonnevie, O. En descriptiv epidemiologisk undersogelsc af ulcussygdommen i Københavns amt. Ugeskr. f. Lceg., accepted.
- Bonnevie, O. Omfanget af ventrikelrøntgen-diagnostik i K0benhavns Amt. To be published.
- Doll, R. pp. 361–379 in Modern Trends in Gastro-Enterology. Butterworth, London, 1952.
- Doll, R., Jones, F. A. & Buckatzsch, M. M. Occupational Factors in the Aetliiology of Gastric and Duodenal Ulcers. His Majesty Stationery Office, London, 1951.
- Dungal, N. & Hansen, H. Schweitz. Z. Path. 1958, 21, 225–228.
- Dunlop, J. M. Scot. med. J. 1968, 13, 192–207.
- Goldsmith, H. S. & Ghosh, B. C. Amer. J. Surg. 1970, 120, 317–319.
- Hansen, J. L. Ugeskr. f. Lceg. 1937, 43, 1145–1152.
- Hansen, J. L. Ændringer i ulcussygdommens fremtrceden 11. Munksgårds Forlag, Copenhagen, 1950.
- Harslöf, V. J. Den operative beliandling af ulcus ventriculi, dets komplikationer og ntermere consequenser. J. Frimodt, Copenhagen, 1907.
- Jennings, D. Lancet 1940, 1, 395–398, 444–447.
- Litton, A. & Murdoch, W. R. Scot. med. J. 1963, 13, 192–201.
- MacMahon, B., Pugh, T. F. & Ipsen, J. Epidemiologic Methods. Litton, Brown and Company, 1960.
- Oi, M., Oshida, K. & Sugimura, S. Gastroenterology 1959, 36, 45–56.
- Pulvertaft, C. N. Brit. J. prev. Med. 1959, 13, 131–138.
- Schancke, K. A eta chir. scand. 1946, 94, Suppl. 115,1–157.
- Sponheim, N. Nord. Med. 1960, 63, 377–385.
- Susser, M. & Stein, Z. Lancet 1962, 1, 115–119.
- Susser, M. J. citron. Dis. 1967, 20, 435–456.
- Varnek, J. Ugeskr. f. Lieg. 1944, 31, 850–854.