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2. 3) M.Arai, H.Doi, Y,Fukui, T.Azuma and T.Fujita: 15th Int. Forge Master Meeting, Tokyo (2003), 261.
3. 4) M.Staubli, R.Hanus, T.Weber, K.H.Mayer and T.-U.Kern: Materials for Advanced Power Engineering, Julich (2006), P.II-855
4. Improved 12Cr Rotor Forging for Ultra-Super-Critical Steam Turbine