TY JOUR TI METHOD OF MULTIGRID FINITE ELEMENTS OF THE COMPOSITE ROTATIONAL AND BI-CURVED SHELL CALCULATIONS KW elasticity KW composites KW multigrid final elements forming FE KW covers of rotation and double curvature KW round plates KW disks KW rings and shafts JO Bulletin of KSAU AU Matveev, A.D. PY 2018 IS PB Krasnoyarsk State Agrarian University