Sokolov, Alexander A., and Oxana S. Rudneva. “Spatial Analysis of Structural and Sectoral Shifts in Russia’s Steppe Zone Regions”. Proceedings of Voronezh State University. Series: Geography. Geoecology0, no. 3 (September 7, 2021): 52-58. Accessed December 5, 2025. https://journals.vsu.ru/geo/article/view/3600.