1. Vitamin A, zinc and lung cancer
2. Plasma vitamin A in patients with bronchial carcinoma
3. Epidemiologic studies of cancer of the stomach, colon and rectum, with special emphasis on the role of diet. Vols. II-III, Ph.D. Thesis, University of Minnesota, University Microfilms, Ann Arbor (1973).
4. Dietary vitamin a and human lung cancer
5. Schuman, L.M., Gart, J.J., and Heuch, I., Dietary factors and lung cancer mortality. The Lutheran Brotherhood study 1966-1977. In: Proceedings, 13th International Cancer Congress, Seattle, September 8-15, 1982.