TY JOUR TI TO THE DEVELOPMENT OF SOIL TILLAGE WORKING UNITS ON THE BASIS OF FIELDS SOLIDGRAMS KW hardness of soils KW solidgram KW power and kinematic disturbance KW combined soil-working unit KW degree of freedom of the working unit KW method of the theory of random oscillations JO Vestnik of Kazan State Agrarian University AU Kazakov, Y.F. AU Medvedev, V.I. AU Terentyev, A.G. AU Pavlov, V.S. AU Smirnov, A.G. AU Akimov, A.P. PY 2018 IS 13 PB Kazan state agrarian University