Czernielewski, J, et al. “Langerhans´ Cells in Patients With Psoriasis: Effect of Treatment With PUVA, PUVA Bath, Etretinate and Anthralin”. Acta Dermato-Venereologica, vol. 65, no. 2, Mar. 1985, pp. 97-101, doi:10.2340/000155556597101.