1. Tarkowski, A., Westberg, G. Rheumatoid factor isotypes and renal disease in systemic lupus erythematosus: Scan J Rheumatol 1987, 16, 309–12.
2. Howard, T.W., Iannini, M.J., Burge, J.J., Davis, J.S. Rheumatoid factor, cryoglobulinemia, anti-dna, and renal disease in patients with systemic lupus erythematosus. J. Rheumatol 1991, 18(6), 826–30.
3. Pinillos, R.M., Sole, J.M.N., Roura, X.J. et al. Rheumatoid factor in patients with systemic lupus erythematosus. Letter Ann Rheum dis 1987, 46, 877–878.
4. Turner-Stokes, L., Jones, M., Addison, I., Mansell, M., Isenberg, D.A. Does rheumatoid factor protect lupus patients from the development of nephritis? Ann Rheum Dis 1989, 48, 14–6.
5. Vitali, C., Bencivelli, W., Isenberg, D.A., Smolen, J.S., Snaith, M.L., Sciuto, M., D'Ascanio, A. Disease activity in systemic lupus erythematosus: report of the Consensus Study Group of the European Workshop for Rheumatology Research. Clin Exp Rheumatol 1992, 10, 527–539.