TY JOUR TI Optimum pattern choice of optical circuits for problems of steel products laser thermal processing by example of railway wheels KW fiber laser KW hardening KW optical circuit KW wear-resistance KW contact-fatigue strength JO Science intensive technologies in mechanical engineering AU Bogdanov, A.V. AU Sokolov, V.I. AU Shmelyov, S.A. PY 2017 IS 2017 PB Bryansk State Technical University