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3. P. Schwartzkopf and R. Kieffer, Refractory Hard Metals, MacMillan, New York, 1953.
4. J.H. Westbrook and E.R. Stover, “Carbides for High Temperature Applications,” High Temperature Technology, ed. by I.E. Campbell and E.M. Sherwood, Wiley, New York, 1967.
5. a)G. Hollox, Mat. Sci. Engr. 3, 121 (1968).