TY JOUR TI RESEARCH OF MULTIFACTORIAL DEPENDENCE OF PRODUCTIVITY AT THE ELECTRICAL DISCHARGE MACHINING OF SMALL OPENINGS KW JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Loyko, A.M. AU Boyko, A.F. AU Pereverzev, S.S. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov