Høyer, H., et al. “65Zinc Absorption in Untreated and D-Penicillamine-Treated Patients With Generalized Scleroderma: Determination by Whole-Body Counting Technique”. Acta Dermato-Venereologica, vol. 62, no. 5, Sept. 1982, pp. 438-40, doi:10.2340/0001555562438440.