1. L. N. Aleksandrova, Soil Organic Matter and the Processes of Its Transformation (Nauka, Leningrad, 1980) [in Russian].
2. L. N. Aleksandrova and O. A. Naidenova, Practical Laboratory Manual on Soil Science (Agropromizdat, Leningrad, 1986) [in Russian].
3. E. V. Arinushkina, Manual on the Chemical Analysis of Soils (Moscow State University, Moscow, 1970) [in Russian].
4. E. A. Dmitriev, Mathematical Statistics in Soil Science (Moscow State University, Moscow, 1995) [in Russian].
5. B. A. Dospekhov, Manual on Field Experiments (Agropromizdat, Moscow, 1985) [in Russian].