1. Beaton G.H.: Epidemiology of iron deficiency. In: Jacobs A., Worwood M. (Eds.), Iron in Biochemistry and Medicine. Academic Press, London, 1974, pp. 477–528.
2. Cook J.D., Lipschitz D.A., Miles L.E.M., Finch C.A.: Serum ferritin as a measure of iron stores in normal subjects. Am. J. Clin. Nutr. 27: 681–687, 1974.
3. Hallberg L.: Iron nutrition and food iron fortification. Semin. Hematol. 19: 31–41, 1982.
4. Hallberg L., Högdahl A.M.: Anaemia and old age. Observations in a population sample of women in Göteborg. Gerontol. Clin. (Basel) 13: 31–43, 1971.
5. HMSO, Department of Health and Social Security: A nutrition survey of the elderly. Report on Health and Social Subjects no. 3. HMSO, 1972.