TY JOUR TI IMPROVING THE QUALITY OF RAPEED OIL FOR USE IN A DIESEL ENGINE KW vegetable oils KW rapeseed oil KW viscosity KW motor fuel KW fuel system KW fuel activator KW chemical properties of fuel JO Vestnik of Kazan State Agrarian University AU Ovchinnikov, E.V. AU Uyutov, S.Y. PY 2021 IS 15 PB Kazan state agrarian University