1. 4) I.Tamura : Met. Sci., 16 (1982), p.245
2. 5) V.F.Zackay, E.R.Parker, D.Farh and R.Bush : ASM Trans. Quart., 60 (1967), p.252
3. 9) F.Ishikawa, T.Takahashi and T. Ochi : Metall. Trans. A, 25 (1994), p.929
4. 11) R.A.Grange : ASM Trans. Quart., 59 (1966), p.26
5. 14) S.Matsuda, T.Inoue, H.Mimura and Y.Okamoto : Proc. of Int. Sympo. on Toward Improved Ductility and Toughness, Climax Molybdenum Co., Kyoto (1971), p.47