Verzhuk, V. G., N. G. Tikhonova, and A. S. Zhestkov. 2005. “Viability of Pollen of Fruit Crops After Low Temperature Storage and Cryopreservation”. Problems of Cryobiology and Cryomedicine 15 (3):302-5. https://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/1114.