Kuznetsova, V. G., and G. F. Zhegunov. “Effect of Extracts from Chicken Embryonic Tissues on Mice With Experimental Leucopenia”. Problems of Cryobiology and Cryomedicine, vol. 18, no. 3, Nov. 2008, pp. 328-31, http://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/403.