Sulli, A., et al. “Nailfold Videocapillaroscopy in Systemic Sclerosis: Diagnostic and Follow-up Parameters and Correlation With Both Specific Serum Autoantibodies and Subsets of Skin Involvement”. Reumatismo, vol. 56, no. 1, Mar. 2004, pp. 36-45, doi:10.4081/reumatismo.2004.36.