The effect of tacalcitol (1,24 (OH)2D3) on cutaneous inflammation, epidermal proliferation and keratinization in psoriasis: a placebo-controlled, double-blind study. - Gerritsen,MJ.; Boezeman,JB.; van Vlijmen-Willems,IM.; Van de Kerkhof,PC. (Br J Dermatol, 1994)