REFERENCES
- Palmer, W. L.: In Cecil, R. L. and Loeb, R. F.: Textbook of Medicine. Ed. 9. Philadelphia, W. B. Saunders Company, 1955, pp. 862–879.
- Äkerlund, A.: The roentgen diagnosis of ulcus duodeni with respect to the local “direct” roentgen symptoms. Acta radiol. 2: 14–27, 1923.
- Äkerlund, A.: Rontgenologische Studien über den Bulbus Duodeni. Acta, radioi., 1923 (supp. 1).