TY JOUR TI IMPROVEMENT OF THE ENERGY RECOVERY SYSTEM OF A TIMBER TRACTOR WITH A LUMBER TRUCK KW timber haulage KW timber tractor KW timber drag KW hydraulic energy recovery KW timber tractor bolster KW timber road JO Forestry Engineering Journal AU Posmetev, V.I. AU Nikonov, V.O. AU Posmetev, V.V. AU Matyashov, A.E. PY 2021 IS 11 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov