1. A. Wahlberg, Jernk. Ann. 85 (1901) 79; J. Iron Steel Inst. 59 (1901) 243 and 60 (1901) 234; Stahl and Eisen 21 (1901) 382 and 465.
2. C. M. Parker, ?The National Emergency Steels NE 8000 Series?, AISI Contribution No. 7, 1942; see also J. Field, Metals Prog. 43 (1943) 402.
3. J. M. Hodge and M. A. Orehoski, Trans. Met. Soc. AIME 167 (1946) 627.
4. F. X. Kayser, R. F. Thomson and A. L. Boegehold, Trans. AMS 45 (1953) 1056.
5. K. J. Irvine, F. B. Pickering and J. Garstone, J. Iron Steel Inst. 196 (1960) 66.