1. Ball, J., Sharp, J.: Rheumatoid arthritis of the cervical spine. Modern Trends in Rheumatology-2. London: Butterworths 1971
2. Bland, J.H.: Rheumatoid arthritis of the cervical spine. Bull. rheum. Dis. 18, 471 (1967)
3. Bland, H.J., Brown, E.W.: Sero-negative and seropositive rheumatoid arthritis. Ann. intern. Med. 60, 88 (1964)
4. Boyle, J.A., Buchanan, W.W.: Clinical Rheumatology. Oxford and Edinburgh: Blackwell 1971
5. Conlon, P.W., Isdale, J.C., Rose, B.S.: Rheumatoid arthritis of the cervical spine. Ann. rheum. Dis. 25, 120 (1966)