Galchenko, S. E. “Tissue and Age Specificity of Aqueous-Saline Extracts from Cryopreserved Xenoorgans Fragments”. Problems of Cryobiology and Cryomedicine, vol. 15, no. 2, June 2005, pp. 153-8, https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/628.