TY JOUR TI MATHEMATICAL MODEL OF THE INTERACTION OF THE SCREW WORKING BODIES OF FOREST FIRE GROUND-THROWING MACHINES WITH THE GROUND COVER KW ground cover KW augers KW forest fire KW earth-throwing machine KW working process JO Forestry Engineering Journal AU Popikov, P.I. AU Pozdnyakov, A.K. PY 2021 IS 11 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov