1. J. G. Fagan and V. W. Amarakoon, Am. Ceram. Soc. Bull. 72 (1993) 70.
2. Idem, ibid. 72 (1993) 69.
3. L. E. Toth, “Transition Metal Carbides and Nitrides” (Academic Press, New York, 1971).
4. H. J. Goldshmidt, “Interstitial Alloys” (Butterworths, London, 1967).
5. H. H. Hausner and M. G. Bowman (eds), “Fundamentals of Refractory Compounds” (Plenum, New York, 1967).