TY JOUR TI Increase of efficiency of removal of stubs by the mechanism with the hydropulsation drive KW grubbing KW machine KW mathematical model KW pulsation JO Actual directions of scientific researches of the XXI century: theory and practice AU Druchinin, D.Y. AU Popikov, V.P. AU Bakaev , A.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov