1. A. H. Sully and E. A. Brandes, ?Chromium? (Butterworths, London, 1967) p. 258.
2. R. L. Samuel and N. A. Lockington, Metal Treatment and Drop Forging 18 (1951) 440.
3. Idem, ibid. 18 (1951) 495.
4. R. L. Samuel, N. A. Lockington and H DorNer, ibid. 22 (1955) 288.
5. P. Galmiche, Rev. Mét. 47 (1950) 192.