1. Combined elevation of IgM and IgA rheumatoid factor has high diagnostic specificity for rheumatoid arthritis;Jonsson;Rheumatol Int,1998
2. How useful are tests for rheumatoid factors, antiperinuclear factors, antikeratin antibody, and the HLA DR4 antigen for the diagnosis of rheumatoid arthritis?;Saraux;Rev Rhum [Engl Ed],1995
3. How useful is the rheumatoid factor? An analysis of sensitivity, specificity, and predictive value;Shmerling;Arch Intern Med,1992
4. The rheumatoid factor: an analysis of clinical utility;Shmerling;Am J Med,1991
5. Rheumatoid factors, anti-filaggrin antibodies and low in vitro interleukin-2 and interferon-gamma production are useful immunological markers for early diagnosis of community cases of rheumatoid arthritis. A preliminary study;Vittecoq;Joint Bone Spine,2001