Levykin, S. V., G. V. Kazachkov, and I. G. Yakovlev. “Agricultural Development Features of the Key Frontier Steppe Region – Orenburg Kray”. Proceedings of Voronezh State University. Series: Geography. Geoecology, no. 1, Feb. 2025, pp. 10-16, doi:10.17308/geo/1609-0683/2025/1/10-16.