Fyrand, O. and Husby, G. (1975) “Deposition of fibrinogen (FR-antigen) in skin diseases. I. Psoriasis vulgaris and Psoriasis arthropathica (with special reference to heparin-precipitable fraction)”, Acta Dermato-Venereologica, 55(3), pp. 175–180. doi: 10.2340/000155555175180.