1Egner W. The use of laboratory tests in the diagnosis of SLE. J Clin Pathol,2000, 53 : 424-432.
2Manoussakis MN, Garalea KL, Tzioufas AG, et al. Testing for antibodies to ENA and to dsDNA is not indicated in FANA-negative sera. Clin Rheumatol. 1988.7: 465-469.