Seidenari, S, et al. “A Quantitative Description of Echographic Images of Sclerotic Skin in Patients With Systemic Sclerosis, As Assessed by Computerized Image Analysis on 20 MHz B-Scan Recordings”. Acta Dermato-Venereologica, vol. 76, no. 5, Sept. 1996, pp. 361-4, doi:10.2340/0001555576361364.