1. M. OKAMOTO, R. TANAKA, T. NAITO and R. FUJIMOTO,J. Iron Steel Inst. Jpn. 48 (1962) 123.
2. G. STEIN, J. MENZEL and H. DORR, in Conference on High Nitrogen Steel 88, Lille, France, 18?20 May 1988, edited by J. Foct and A. Hendry (Institute of Metals, London, 1989) p. 32.
3. J. RAWERS, J. DUNNING and R. REED,Adv. Mater. Processes 138 (2) (1990) 50.
4. R. REED,J. Met. 41 (3) (1989) 16.
5. Desk Edn. Ch.,1985