TY JOUR TI MATHEMATICAL MODEL OF INTERACTION OF MILLING KNIVES WITH SOIL KW mathematical model KW tiller KW milling knife KW power characteristics KW angle of rotation. JO Vestnik of Kazan State Agrarian University AU Akimov, A.P. AU Konstantinov, Y.V. AU Turovskiy, B.V. PY 2018 IS 12 PB Kazan state agrarian University