Flisiak, I, et al. “Effect of Psoriasis Activity on Metalloproteinase-1 and Tissue Inhibitor of Metalloproteinase-1 in Plasma and Lesional Scales”. Acta Dermato-Venereologica, vol. 86, no. 1, Apr. 2006, pp. 17-21, doi:10.1080/00015550510011600.