1. Badley, B. W. D., Ansell, B. M.: Fractures in Still's disease. Ann. rheum. Dis.19, 135 (1960).
2. Barnett, E., Nordin, B.E.C.: The radiological diagnosis of osteoporosis. A new approach. Clin. Radiol.11, 166 (1960).
3. Garn, S. M., Rohmann, C. G., Nolan, P.: The developmental nature of bone changes during aging (J. E. Birren, ed.) Springfield, Ill.: Charles C. Thomas 1963.
4. Lawrence, J. S., Sharp, J., Ball, J., Bier, F.: Rheumatoid arthritis of the lumbar spine. Ann. rheum. Dis.23, 205 (1964).
5. McConkey, B., Fraser, G. M., Bligh, A. S.: Osteoporosis and purpura in rheumatoid disease: Prevalence and relation to treatment with corticosteroids. Quart. J. Med.31, 419 (1962).