1. A.A. Solomon and F. Hsu. Submitted to the J. Amer. Ceram. Soc., for publication.
2. C. Herring, J. Appl. Phys., 21: 437 (1950) and “The Physics of Powder Metallurgy,” ed. W.E. Kingston, McGraw Hill, New York, 143 (1951).
3. B.R.T. Frost, Nucl. Appl. and Tech., 9, 128 (1970).
4. J.A. Turnbull and M.O. Tucker, Phil. Ma., 30, 47 (1974).
5. S.R. MacEwen and I.J. Hastings, Phil. Mag., 31: 1, 135 (1975).