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2. D. S. Bulgakov, I. I. Karmanov, D. I. Rukhovich, and E. V. Vil’chevskaya, “Agroclimatic areas with the lists of major crops: a map,” in National Soil Atlas of the Russian Federation, Ed. by S. A. Shoba (Astrel’, Moscow 2011), pp. 290–292.
3. D. S. Bulgakov, D. I. Rukhovich, E. A. Shishkonakova, and E. V. Vil’chevskaya, “Separation of agroclimatic areas for optimal crop growing within the framework of the natural–agricultural zoning of Russia,” Eurasian Soil Sci. 49, 1049–1060 (2016).
4. D. S. Bulgakov, D. I. Rukhovich, E. A. Shishkonakova, and E. V. Vil’chevskaya, “Agroecological potential of arable lands of Russia,” Pochvoved. Agrokhim., No. 1 (54), 28–34 (2015).
5. P. P. Vavilov, Crop Growing (Agropromizdat, Moscow, 1986) [in Russian].