1. H. E. Collins:Trans. ASM, 1969, vol. 62, p. 82.
2. L. R. Woodyatt, C. T. Sims, and H. J. Beattie, Jr.:Trans. TMS-AIME, 1966, vol. 236, p. 519.
3. E. S. Machlin and J. Shao:Scr. Met., 1977, vol. 11, p. 859.
4. E. S. Machlin and P. T. Gee:J. Solid State Chem., 1978, vol. 24, no. 3.
5. J. Shao: Masters Thesis, Columbia University, New York, New York, May 1977.