Volkova, N. O. “Study of Morphological Characteristics of Cryopreserved Cell Cultures of Stromal Origin”. Problems of Cryobiology and Cryomedicine, vol. 22, no. 2, June 2012, pp. 118-25, https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/72.