Fernandez, Solange Assuncion Villagra, et al. “ Prevalence of Antinuclear Autoantibodies in the Serum of Normal Blood Dornors ”. Revista Do Hospital Das Clínicas, vol. 58, no. 6, Jan. 2003, pp. 315-9, https://doi.org/10.1590/S0041-87812003000600005.