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3. Cartographic analysis of social and natural phenomena on the territory of the Belgorod region in the 18th, 19th and 20th centuries;V. G. Belevantsev,2015
4. N. V. Denisova, “Soil cover of the Kursk experimental station,” in Scientific Works of the Kursk Agricultural Experimental Station (Kursk, 1967), Vol. 1, pp. 27–31.
5. P. P. Dmitriev and O. I. Khudyakov, Pedogenesis in the Settlements of Burrowing Mammals (KMK, Moscow, 2018) [in Russian].