Zubov, D. O. “Functional Characteristics of Human Cultured Intervertebral Disc Chondrocytes and Adipose-Derived Stem Cells”. Problems of Cryobiology and Cryomedicine, vol. 22, no. 2, June 2012, pp. 148-52, http://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/77.