1. H. Poritsky,Physics 5 (1934) 79.
2. B. A. Boley andJ. H. Weiner, ?Theory of Thermal Stresses? (John Wiley and Sons) (1960) p. 298.
3. D. A. Krohn andA. R. Cooper,J. Amer. Ceram. Soc. 52 (1969) p.661.
4. S. S. Hecker, C. H. Hamilton, andL. J. Ebert, to be publishedJournal of Materials, December (1970).
5. L. J. Ebert, R. J. Fedor, C. H. Hamilton, S. S. Hecker, andP. K. Wright, AFML-TR-69-129, June 1969, AD-857, 059.