B. Kirby, O. Al-Jiffri, R. Cooper, G. Corbitt, P. Klapper, and C. Griffiths, “Investigation of cytomegalovirus and human herpes viruses 6 and 7 as possible causative antigens in psoriasis”, Acta Derm Venereol, vol. 80, no. 6, pp. 404–406, Nov. 2000.