TY JOUR TI THE DETERMINATION OF TRACTION RESISTANCE OF THE PLOUGH SHARE WITH BASIC "SKIS" KW course depth KW plough shares KW trac-tion resistance KW the speed of movement KW the angle of attack JO Bulletin of KSAU AU Shevchenko, A.P. AU Begunov, M.A. PY 2016 IS PB Krasnoyarsk State Agrarian University