1. J. E. Schoutens, unpublished data.
2. E. D. Karsten, Martin Marietta Corporation, Denver Division, Denver, Colorado, Personal Communication, January (1982).
3. J. D. Whittenberger, F. I. Hurwitz, J. J. Ricca and R. M. Jurta, J. Mater. Sci. Lett. 1 (1982) 249.
4. N. A. Pratten, J. Mater. Sci. 16 (1981) 1737.
5. S. W. Tsai and H. T. Hahn, ?Introduction to Composite Materials? (Technomic Publishing Company, Westport, Connecticut, 1980) p. 381.