1. Humic Substances: Structure, Function, Mechanism of Action, Protective Properties and Ecological Role;Gorovaya,1995
2. MGU, Moscow;Methods of Soil Microbiology and Biochemistry,1991
3. Methods of Field Experiments;Dospehov,1985
4. Plant Exudates and Their Value in Life of Phytocenoses;Ivanov,1973
5. The Role of Root Exudates of Plants in the Formation of the Biochemical Properties of the Root Environment;Homyakov,2009