TY JOUR TI THE CALCULATION OF LASER CUTTING COST IN TOOL PATH OPTIMIZATION PROB-LEM FOR CNC MACHINES KW JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Tavaeva, A.F. AU Petunin, A.A. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov