Galchenko, S. E. “Cryopreservation of Porcine Spleen Fragments in the Presence of Polyethylenoxides”. Problems of Cryobiology and Cryomedicine, vol. 16, no. 1, Mar. 2006, pp. 82-87, http://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/620.