Maslova, O. O., N. S. Shuvalova, O. M. Sukhorada, O. G. Deryabina, and M. V. Makarenko. “Changes in Morphofunctional Characteristics of Umbilical Cord Matrix Mesenchymal Cells During Passaging”. Problems of Cryobiology and Cryomedicine, vol. 22, no. 2, June 2012, pp. 153-6, http://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/78.