1. Aggarwal A. et al. Serum IgM-rheumatoid factor by ELISA delineated a subset of patients with deforming joint disease in seronegative juvenile rheumatoid arthritis. Rheumatol Int, 14, 876–81 (1994).
2. Alvares G.J. et al Measurement and comparison of the rheumatoid factors class IgG, IgM and IgA in chronic juvenile arthritis. Anales Espanoles de Pediatria, 31, 6, 554–558 (1989).
3. Anderson G, Fasth A. The natural history of juvenile chronic arthritis: A population based cohort study. Onset and disease process. J. rheumatol. , 22, 295–307 (1995).
4. Ansell B.et al. A. color atlas of paediatric rheumatology. London, Wolf Publishing Ltd. pp 13–67. (1991)
5. Bianko N., et al. Immunologic studies of juvenile arthritis. Arthritis Rheum 14, 685–696 (1971).