TY JOUR TI METHODS OF MATERIAL CHOICE FOR COG-WHEELS KW steel KW case-hardening KW physical and stress-strain characteristics KW cylindrical cog-wheels KW wear-resistance KW durability (life). JO Bulletin of Bryansk state technical university AU Tikhomirov , V.. AU Strizhenok , A.. PY 2016 IS 2016 PB Bryansk State Technical University