1. L.A. Carapella: Met. Progr., 1944, vol. 46, p. 108.
2. P. Payson and C.H. Savage: Trans. ASM, 1944, vol. 33, p. 261.
3. E.S. Rowland and S.R. Lyle: Met. Progr., 1945, vol. 47, p. 907.
4. R.A. Grange and H.M. Stewart: Trans. AIME, 1946, vol. 167, p. 467.
5. A.E. Nehrenberg: Trans. AIME, 1946, vol. 167, p. 494.