Portnoy, B. and Beck, M. 1981. The treatment of active chronic psoriasis: a comparison of the effectiveness of a preparation containing 0.1% dithranol and 17% urea in a cream base and 0.1% dithranol in Lassar´s past B.P.C. Acta Dermato-Venereologica. 61, 5 (Sep. 1981), 459–461. DOI:https://doi.org/10.2340/0001555561459461.