1. Dix, E.H. and Richardson, H.H. (1926) Trans. AIME, 73, 560.
2. Knock, J.A., Holt M. and Sprowls, D.O. (1961) Metal Progress, 80 (3), 87.
3. Wilm, A. (1911) Metallurgie, 8, 225.
4. Mozely, P.P. (1943) J. Aer. Sci, 10 (6), 180.
5. Dix, E.H. (1945) Trans. AIME, 35, 130.