1. Course and prognosis in rheumatoid arthritis;R, Duthie J.J.; E, Brown P.; H, Truelove L.; D, Baragar F.; J, Lawrie A.;Ann Rheum Dis,1964
2. The rheumatoid factor in definite rheumatoid arthritis;Sievers, K.;Acta Rheumatol Scand,1965
3. Significance of positive tests for rheumatoid factor in the prognosis of rheumatoid arthritis;Cats, A.; M, Hazevoet H.;Ann Rheum Dis,1970
4. Prognostic value of early features in rheumatoid disease;Fleming, A.; M, Crown J.; Corbett, M.;BMJ,1976
5. Isotype-specific measurement of rheumatoid factor with reference to clinical features of rheumatoid arthritis;Tarkowski, A.; A, Nilsson L.,1983