@article{Lyubavskiy2015the, author={Lyubavskiy, N..}, title={The implement for an estimate}, 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={2015}, pages={136-140}, volume={3}, issue={2}, }