Rozanova, S. L., E. I. Naumenko, E. D. Rozanova, and O. A. Nardid. 2010. “Change of Antioxidative Properties of Human Placental Extracts After Freezing”. Problems of Cryobiology and Cryomedicine 20 (3):288-96. https://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/188.