Govorukha, T. P., N. V. Repin, and O. M. Tsupikov. “Structural Characteristics of Placenta Tissue After Incubation With DMSO”. Problems of Cryobiology and Cryomedicine, no. 2, June 2006, pp. 91-97, http://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/1033.