Kellgren J.H., O’Brien W.M. On the natural history of rheumatoid arthritis in relation to the sheep cell agglutination test (SCAT), Arthritis. Rheum., 1962, 5, 115
 Sharp J.T., Calkins E., Cohen A.S., Schubart A.F., Calabro J.J. Observations on the clinical, chemical, and serological manifestations of rheumatoid arthritis, based on the course of 154 cases, Medicine (Baltimore), 1964, 43, 41–58
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