1. 25-hydroxyvitamin D and vitamin D in human milk;Ala-Houhala;American Journal of Clinical Nutrition,1988
2. Andersen, N. L., Fagt, S., Groth, M. V., Hartkopp, H. B., Møller, A., Ovesen, L., & Warming, D. L. (1996). Danskernes kostvaner 1995. Levnedsmiddelstyrelsen, Publication No. 235.
3. An investigation of sources of variation in calcium absorption efficiency;Barger-Lux;Journal of Clinical Endocrinology and Metabolism,1995
4. Evidence of a probable role for 25-hydroxyvitamin D in the regulation of human calcium metabolism;Bell;Journal of Bone and Mineral Research,1988
5. Vitamin B12, E and D content of raw and cooked beef;Bennink;Journal of Food Science,1982