N. N. LOGINOVA, I. A. SEMINA, and O. U. PERETOCHENKOVA, “DEMOGRAPHIC DEVELOPMENT OF RUSSIAN REGIONS WITH A FOCUS ON THE REPUBLIC OF MORDOVIA AGAINST THE BACKGROUND OF COVID-19 PANDEMIC STATISTICS”, ГС, vol. 23, no. 4, pp. 78–84, Jul. 2021, doi: 10.22394/2070-8378-2021-23-4-78-84.