Ostashko, F. I., and V. F. Ostashko. “Ways to Improve Media for Culturing and Preservation of Sexual Cells”. Problems of Cryobiology and Cryomedicine, vol. 19, no. 3, Nov. 2009, pp. 375-7, http://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/261.