1. Taccari, E., Spadaro, A., Riccieri, V., Grandilli, M.A., Zoppini, A. Avascular necrosis of the femoral head in long-term follow-up of systemic sclerosis: report of two cases. Clin Rheumatol 1989, 8, 386–392.
2. LeRoy, E.C., Black, C., Jablonska, S., Krieg, T., Medsger, T.A. Jr., Rowell, N., Wollheim, F. Scleroderma (systemic sclerosis): classification, subsets, and pathogenesis. J Rheumatol 1988, 15, 202–205.
3. Wilde, A.H., Mankin, H.J., Rodnan, G.P. Avascular necrosis of the femoral head in scleroderma. Arthritis Rheum 1970, 13, 445–447.
4. Abeles, M., Urman, J.D., Rothfield, N.F. Aseptic necrosis of bone in systemic lupus erythematosus: relationship to corticosteroid therapy. Arch Intern Med 1978, 138, 750–754.
5. Dubois, E.L. Lupus Erythematosus, 2nd ed. Los Angeles, Los Angeles University of Southern California Press, 1974, 332–342.