1. L. N. Aleksandrova, Soil Organic Matter and the Processes of Its Transformation (Nauka, Leningrad, 1980) [in Russian].
2. A. L. Aleksandrovskii, Soil Evolution on the East European Plain during the Holocene (Nauka, Moscow, 1983) [in Russian].
3. Anthropogenic Evolution of Chernozems (A. P. Shcherbakov and I. I. Vasenev (Eds.) (Voronezh Univ., Voronezh, 2000) [in Russian].
4. B. P. Akhtyrtsev and A. B. Akhtyrtsev, “Paleochernozems of the Central Russian Forest-Steppe in the Late Holocene,” Pochvovedenie, No. 5, 614–624 (1994).
5. N. F. Ganzhara and B. A. Borisov, “Application of the Indices of Soil Humus Budget for Assessing Soil Loss Tolerance,” in Soil Science: Aspects, Problems and Solutions (Dokuchaev Soil Sci. Inst., Moscow, 2003), pp. 609–618 [in Russian].