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Schweigert, F. J. and Uehlein-Harrell, S. and Hegel, G. von and Wiesner, Henning (1991): Vitamin A (Retinol and Retinyl Esters, a-Tocopherol and Lipid Levels in Plasma of Captive Wild Mammals and Birds. In: Journal of veterinary medicine / Series A = Zentralblatt für Veterinärmedizin / Reihe A, Vol. 38, He: pp. 35-42