1. Lewis, A.F.: Fracture of the neck of the femur: changing incidence. Brit. Med. J., 283: 1217–1220, 1981.
2. Baker, M.R. and Dickson, R.A.: Femoral neck fractures — two populations. Lancet, II: 70–72, 1983.
3. Garn, S.M., Rohman, C.G., and Wagner, B.: Bone loss as a general phenomenon in man. Fed. Proc. 26: 1729–1736, 1967.
4. Chalmers, J.: Distribution of osteoporotic changes in the aging skeleton. Clin. Endocr. Metabol., 2: 203–220, 1973.
5. Nordin, B E.C.: Metabolic bone and stone disease. Edinburgh-Lincoln, Churchill Livingstone, 1973.