TY JOUR TI THE OPERATIONAL EFFICIENCY AND PASSABILITY ASSESSMENT OF THE WHEEL SKIDDING TRACTORS WITH HYDROMECHANICAL TRANSMISSION KW the wheel skidding tractor KW hydromechanical transmission KW skidding portage KW passability assessment JO Bulletin of KSAU AU Kochnev, A.M. AU Yushkov, A.N. PY 2013 IS PB Krasnoyarsk State Agrarian University