A. A. Chibilyov, A. A. Chibilyov (jr.), O. S. Rudneva, A. A. Sokoplov, Yu. A. Padalko, D. S. Meleshkin, D. V. Grigorevsky. Problems of Sustainable Development of Socio-Economic Geosystems of the Steppe Zone of the Russian Federation. Orenburg: Institute of Steppe of the Ural branch of the RAS, 2018. 128 p. [in Russian] - PDF (Russian)