Safranchuk, O. V., M. A. Sirous, and A. N. Goltsev. “Morphofunctional Characteristics of Cancer Stem Cells Prior to and After Cryopreservation”. Problems of Cryobiology and Cryomedicine, vol. 18, no. 1, May 2008, pp. 119-23, https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/467.