Zhukov Аnatoliy, and Walery Zukow. “Silver Against the Coronavirus Epidemic = Серебро против эпидемии коронавирусов”. Journal of Education, Health and Sport 10, no. 3 (March 17, 2020): 83–97. Accessed July 8, 2025. https://apcz.umk.pl/JEHS/article/view/JEHS.2020.10.03.008.