TY JOUR TI TO THE ECONOMIC EFFECT ASSESSMENT FROM THE ROLL BEARING DURABILITY INCREASE IN THE WORKING MACHINES KW bearing KW durability KW economic effect JO Bulletin of KSAU AU Liberman, Y.L. AU Boyarskikh, Y.D. AU Gorbunova, L.N. PY 2013 IS PB Krasnoyarsk State Agrarian University