TY JOUR TI FINISH-STRENGTHENING EFFECTIVENESS INCREASE BASED ON USE OF SCREW ROTORS WITH WAVE SURFACE ON PERIMETER KW finish-strengthening KW combined rotor KW operation body KW wave surface KW perimeter KW loading weight JO Bulletin of Bryansk state technical university AU Lebedev, V.A. AU Serga, G.V. PY 2019 IS 2019 PB Bryansk State Technical University