1. Sharp, G. C. et a!. (1976). NEJM, 295, 1149.
2. Unger, A., Panayi, G. S., and Tidman, N. (1977). Ann. rheum. Dis., 36, 66-70.
3. Lymphocytotoxic antibodies in systemic lupus;erythematosus: association with cerebral; manifestations. B. Bresnihan; Grigor, R.; Oliver, M.; Hughes, G.R.V.;Royal Postgraduate Medical School
4. HLA B27 is significantly less than in patients with ankylosing spondylitis alone (Eastmond and Woodrow,1977
5. In a series of 116 patients with ankylosing spondylitis alone 14 were B27 negative, Of these;102 B27;the; did not differ from,1977