TY JOUR TI SPECIAL TAP FOR CUTTING INTERNAL SMALL-SIZED THREADS KW thread-cutting tool KW threading KW tap KW CAD system KW CAE system JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Nikitina, I.P. AU Polyakov, A.N. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov