Pogozhikh, D. N., E. D. Rozanova, and O. A. Nardid. 2008. “Change of Properties of Human Placenta Aqueous-Saline Extracts During Low Temperature Storage”. Problems of Cryobiology and Cryomedicine 18 (1):22-26. https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/443.