Timon, V. V., T. F. Petrenko, and E. I. Goncharuk. 2007. “Cryopreservation of Human Fetal Fibroblast Culture”. Problems of Cryobiology and Cryomedicine 17 (1):80-85. https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/535.