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3. Hereditary C4 deficiency—genetic studies and linkage to HLA;Ballow;Transplantation Proc,1979
4. Systemic lupus erythematosus in a patient with C4 deficiency;Urowitz;J Rheumatol,1981
5. Serial complement component alterations in acute glomerulonephritis and systemic lupus erythematosus;Kohler;Clin Exp Immunol,1969