TY JOUR TI STATE OF THE PROBLEM OF THE DYNAMICS OF TOWER CRANES TAKING INTO ACCOUNT LARGE DISPLACEMENTS KW tower crane KW stability KW finite element method KW hardness KW dynamics of the tower cranes JO Vestnik of Astrakhan State Technical University AU Bulatov, Z.. AU Sinelshchikov, A.. PY 2014 IS 2014 PB Astrakhan State Technical University