TY JOUR TI Analysis of the effectiveness of hitch tractor unitized them with disc tools KW hitch KW tractor KW disc tools KW calculation JO Actual directions of scientific researches of the XXI century: theory and practice AU Posmetev, V.. AU Latysheva, M.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov