Prokopyuk, V. Y. “Cryopreserved Chorionic Tissue in Maternal and Fetal Infection Therapy (Clinical and Experimental Research)”. Problems of Cryobiology and Cryomedicine, vol. 21, no. 3, Sept. 2011, pp. 338-49, http://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/132.