Rozanova, S. L., E. D. Rozanova, O. A. Nardid, and V. G. Karpenko. 2011. “Antioxidant Activity of Placenta Extracts After Low Temperature and Hypothermic Storage”. Problems of Cryobiology and Cryomedicine 21 (3):291-300. https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/127.