1. Agrochemical Analysis of Soils (Moscow, 1975) [in Russian].
2. V. M. Alifanov, L. A. Gugalinskaya, and A. Yu. Ovchinnikov, Paleocryogenesis and Diversity of Soils in the Center of the East European Plain (GEOS, Moscow, 2010) [in Russian].
3. E. V. Arinushkina, Manual for the Chemical Analysis of Soils (Moscow State Univ., Moscow, 1970) [in Russian].
4. V. V. Berdnikov, Paleocryogenic Microrelief in the Center of the Russian Plain (Nauka, Moscow, 1976) [in Russian].
5. N. S. Bolikhovskaya, Evolution of Loess-Soil Formation of Northern Eurasia (Moscow State Univ., Moscow, 1995) [in Russian].