TY JOUR TI THE INTERACTION PROCESS OF BLADE COG OF DISK-SHAPED SPRING WITH THE SOIL KW disk-shaped spring KW soil KW blade cog KW helical surface. JO Vestnik of Kazan State Agrarian University AU Shiriyazdanov, R.. AU Pikmullin, G.V. AU Yunusov, R.. AU Bulgariev, G.G. PY 2016 IS 11 PB Kazan state agrarian University