1. R. Kieffer and P. Schwarzkopf, Hartstoffe und Hartmetalle (Springer, Berlin, 1953).
2. E. Rudy and H. Nowotny, Monatsh. Chem. 94, 507 (1963).
3. A. Markström, D. Andersson, and K. Frick, CALPHAD, No. 32, 615 (2008).
4. Handbook of Refractory Carbides and Nitrides. Properties, Characteristics, Processing and Apllications, Ed. by H. O. Pierson (Noyes Publ., 1996).
5. C. Agte and H. Alterthum, Zeitschr. Tech. Phys. 6, 182 (1930).