1. A. L. Aleksandrovskiy, “Evolution of chernozems in the region of middle stream of the Don River in Holocene,” Pochvovedenie, No. 11, 5–13 (1984).
2. A. L. Aleksandrovskiy and E. I. Aleksandrovskaya, Evolution of Soils and the Geographical Environment (Nauka, Moscow, 2005) [in Russian].
3. B. P. Akhtyrtsev and A. B. Akhtyrtsev, “Meadow-chernozem paleosols of the Bronze Age in the Oka–Don forest-steppe,” Pochvovedenie, No. 7, 26–38 (1990).
4. B. P. Akhtyrtsev and A. B. Akhtyrtsev, “Paleochernozems of the Central Russia forest-steppe in the Late Holocene,” Pochvovedenie, No. 5, 14–24 (1994).
5. N. V. Blagoveshchenskaya, “Holocene dynamics of forest ecosystems on the upper plateau of the Volga Upland,” Russ. J. Ecol. 37 (2), 73–78 (2006).