Stegniy, M. Y. “Study of RNA Diarrhea Virus Strains Exposed to Cold Temperature Effect”. Problems of Cryobiology and Cryomedicine, vol. 15, no. 3, Sept. 2005, pp. 276-8, https://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/1102.