@article{Shchegolkov2014, author={Shchegolkov, A.. and Shchegolkov, A.. and Popova, A..}, title={}, journal={Actual directions of scientific researches of the XXI century: theory and practice}, publisher={FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov}, year={2014}, pages={136-139}, volume={2}, issue={4}, }