1. F. Borik and W. Scholz, J. of Materials,6, 3, 590 (1971).
2. H. Avery, Amer. Soc. for Metals, Cleveland (1954), Chapter 3.
3. J. Boyes, Iron and Steel, 2, 57?63 (1969).
4. J. Muscara and M. Sinnott, Metals Engng. Quart. ASM, 5 (1972).
5. Stauffer, Schweizer Archiv, 218 (1958).