Rozanova, S. L., E. D. Rozanova, O. A. Nardid, and V. G. Karpenko. “Antioxidant Activity of Placenta Extracts After Low Temperature and Hypothermic Storage”. Problems of Cryobiology and Cryomedicine, vol. 21, no. 3, Sept. 2011, pp. 291-00, https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/127.