TY JOUR TI METHODOLOGY FOR DETERMINING THE OPTIMUM QUANTITY AND VALUE OF OPERATING RATIONS OF THE SKIDDER WITH MECHANICAL AND AUTOMATIC TRANSMISSIONS KW mechanical transmission KW hydro mechanical transmission KW skidder KW productivity KW specific fuel consumption KW hydrostatic transmission JO Bulletin of KSAU AU Vu, H.. AU Valyazhonkov, V.D. AU Martynov, B.G. AU Andronov, A.V. PY 2014 IS PB Krasnoyarsk State Agrarian University