Serup, J., and Blichmann C. “Epidermal Hydration of Psoriasis Plaques and the Relation to Scaling. Measurement of Electrical Conductance and Transepidermal Water Loss”. Acta Dermato-Venereologica, vol. 67, no. 4, July 1987, pp. 357-9, doi:10.2340/0001555567357359.