TY JOUR TI INCREASING OF THE SKIDDING TRACTOR FUEL AND ECONOMIC INDICES BY OPTIMIZING THE TRANSMISSION PARAMETERS KW skidding tractor KW maximum efficiency KW fuel consumption KW wood JO Bulletin of KSAU AU Wu Hay, C.. AU Valyazhonkov, V.D. AU Mikhaylov, O.A. PY 2013 IS PB Krasnoyarsk State Agrarian University