1. Barnett, C. H., Cochrane, W., and Palfrey, A. J. (1963). Ann. rheum. Dis., 22, 389.
2. Changes in the Knee Joint at Various Ages;Bennett, G.A.; Waine, H.; Bauer, W.,1942
3. The Pathology of Articular and Spinal Diseases;Collins, D.H.;Chap,1949
4. and McElligott T. F. (1960). Ann. rheum. Dis., 19, 318.
5. and McElligott T. F. and Meachim, G. (1961). Ibid., 20, 117.