Bonifati, C, et al. “Interleukin-1-Beta, Interleukin-6, and Interferon-Gamma in Suction Blister Fluids of Involved and Uninolved Skin and in Sera of Psoriatic Patients”. Acta Dermato-Venereologica, vol. 74, Feb. 1994, pp. 23-24, doi:10.2340/000155651862324.