Todrin, A. F., N. N. Chub, O. V. Lipina, V. V. Chekanova, E. E. Nipot, V. I. Pinyaev, P. Todorov, and O. A. Gorobchenko. “Biophysical Characteristics of Human Follicular Fluid Prior To and After Low Temperature Preservation”. Problems of Cryobiology and Cryomedicine, vol. 18, no. 4, Dec. 2008, pp. 420-2, https://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/343.