“Streltsova T.A. Natural Virus-Free Grounds of the Altai Mountains As longevity’s Bioresource of Valuable Varieties and Problems of Potato Degeneration: Gorno-Altaisk State University, Gorno-Altaisk, Russia”. 2018. Eurasian Journal of Ecology 46 (1): 198-213. https://bulletin-ecology.kaznu.kz/index.php/1-eco/article/view/861.