1. A. L. Aleksandrovskii, “Changes in soils and natural environment in the south of Russia in the Holocene,” OPUS: Mezhdistsiplin. Issled. Arkheol., Nos. 1–2, 109–119 (2002) [in Russian].
2. Z. P. Antonova, L. G. Skalabyan, and L. G. Suchilkina, “Determination of humus content in soils,” Pochvovedenie, No. 11, 130–133 (1984).
3. E. V. Arinushkina, Manual on the Chemical Analyses of Soils (Mosk. Univ., Moscow, 1970) [in Russian].
4. A. V. Borisov, T. S. Demkina, and V. A. Demkin, Paleosols and Climate of Ergeni Upland in the Bronze Age (IV-II Millennium BC) (Nauka, Moscow, 2006) [in Russian].
5. A. F. Vadyunina and Z. A. Korchagina, Methods for Studying the Physical Properties of Soils (Agropromizdat, Moscow, 1986) [in Russian].