1. 1) K.Born : Stahl Eisen, 73 (1953), 1268.
2. 2) A.Nicholson and J.D.Murray : J. Iron Steel Inst., 203 (1965), 1007.
3. 3) I.L.May and L.M.Schetky : Copper in Iron and Steel, John Wiley & Sons, Inc., New York, (1982), 45.
4. 5) H.Yamauchi, M.Miwa and H.Kobayashi : Bull. Iron Steel Inst. Jpn., 4 (1995), 378.
5. 6) Y.Mizukami : Trans. Soc. Instrum. Control Eng., 36 (1997), 691.