TY JOUR TI improvement of the conformity confirmation system of the rf on the basis of benchmarking of the systems of russia and the usa KW confirmation of conformity KW PS KW voluntary PS KW RF KW USA KW voluntary certification KW aircraft industry JO Theoretical economics AU Shastina, E.M. AU Gulin, V.M. PY 2023 IS 0 PB Yaroslavl State Technical University