1. E. Rudy, C. E. Brukl, and D. P. Harmon, AFML-TR-65-2 Part I Vol. V, 1965.
2. E. K. Storms, LAMS-2674 Chem. TID-4500 Feb. 1962.
3. Idem, “The Refractory Carbides” (Academic Press, London and New York, 1967) p. 87.
4. R. Lesser and G. Brauer, Z. Metallk. 49 (1958) 122.
5. I. Zaplatynsky, J. Amer. Ceram. Soc. 49 (1966) 109.