Baldini, C., A. Tavoni, G. Merlini, M. Sebastiani, and S. Bombardieri. “Primary Sjogren’s Syndrome: Clinical and Serological Feature of a Single Centre”. Reumatismo, vol. 57, no. 4, Dec. 2005, pp. 256-61, doi:10.4081/reumatismo.2005.256.