L. Savolainen, J. Kontinen, E. Alatalo, J. Röning, and A. Oikarinen, “Comparison of Actual Psoriasis Surface Area and the Psoriasis Area and Severity Index by the Human Eye and Machine Vision Methods in Following the Treatment of Psoriasis”., Acta Derm Venereol, vol. 78, no. 6, pp. 466–467, Dec. 1998.