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5. I. V. Ivanov and Yu. G. Chendev, “History of the development of chernozems in the Central Chernozem Region and their modern humus profile,” in Proceedings of the Scientific Conf. Dedicated to the 100th Anniversary of Prof. N.I. Bazilevich “Geography of Productivity and Biogeochemical Cycle in Terrestrial Landscapes” (Institute of Geography, Russian Academy of Sciences, Moscow, 2010), pp. 67–77.