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Bluestone R, Goldberg LS. Effect of D-penicillamine on serum immunoglobulins and rheumatoid factor. Ann Rheum Dis. 1973 Jan;32(1):50–52.[PMC free article][PubMed]
Farr M, Kendall MJ, Young DW, Meynell MJ, Hawkins CF. Assessment of rheumatoid activity based on clinical features and blood and synovial fluid analysis. Ann Rheum Dis. 1976 Apr;35(2):163–167.[PMC free article][PubMed]