1. Hone, A., and Pearson, E. C., Metal Progress, 53 (3), 363 (1948).
2. Woodward, D. H., J. Metals, 1 (10), 722 (1949).
3. Baeyertz, M., Trans. Amer. Inst. Min. Met. Eng., 117, 151 (1935).
4. Jones, O., Phil. Mag., 48, 207 (1924).
5. Edwards, J. D., and Keller, F., Metals Tech., 11 (3) (1944). Tech. Pub. No. 1710.