1. Killebrew, K., Gold, R.H., Sholkoff, D. Psoriatic spondylitis. Radiology 1973, 108, 9–16.
2. Kaplan, D., Plotz, C.M., Nathanson, L., Frank, L. Cervical spine in psoriasis and in psoriatic arthritis. Ann Rheum Dis 1964, 23, 50–56.
3. McEwen, C., DiTata, D., Lingg, C., Porini, A., Good, A., Rankin, T. Ankylosing spondylitis and spondylitis accompanying ulcerative colitis, regional enteritis, psoriasis and Reiter's disease. Arthritis Rheum 1971, 14, 291–318.
4. Lambert, J.R., Wright, V. Psoriatic spondylitis: a clinical and radiological description of the spine in psoriatic arthritis. Q J Med 1977, 184, 411–425.
5. Blau, R.H., Kaufman, R.L. Erosive and subluxing cervical spine disease in patients with psoriatic arthritis. J Rheumatol 1987, 14, 111–117.