TY JOUR TI THE EFFICIENCY OF THE TRACTOR WITH THE ENGINE OF CONSTANT POWER AS A PART OF TILLING UNIT KW efficiency KW tractor KW constant power engine KW soil-cultivating unit KW rational modes KW power and technical and economic parameters KW multi-objective optimization JO Bulletin of KSAU AU Zhuravlev, S.Y. PY 2018 IS PB Krasnoyarsk State Agrarian University