Turgel, I. ., and E. . Ulyanova. “ANALYSIS OF POPULATION CONCENTRATION AND ECONOMIC ACTIVITY IN THE LARGEST REGIONAL CAPITALS OF RUSSIA”. Journal of the Geographical Institute “Jovan Cvijić” SASA, vol. 69, no. 3, Dec. 2019, pp. 229–239, doi:10.2298/IJGI1903229T.