TY JOUR TI Scientifically substantiated optimization of cutter life on criterion of cost price KW durability KW coefficient of variation KW distribution law KW optimization KW cost price JO Science intensive technologies in mechanical engineering AU Mikhailov, A.N. AU Ivchenko, T.G. AU Petryaeva, I.A. PY 2018 IS 2018 PB Bryansk State Technical University