Gaál, J. et al. 2009. Immunological and Clinical Effects of Alphacalcidol in Patients with Psoriatic Arthropathy: Results of an Open, Follow-up Pilot Study. Acta Dermato-Venereologica. 89, 2 (Feb. 2009), 140–144. DOI:https://doi.org/10.2340/00015555-0555.