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3. C. Agte and H. Alterthum, Z. Techn. Phys., No. 6, 182 (1930).
4. V. V. Fesenko and A. S. Bolgar, Vaporization of Refractory Materials (Metallurgiya, Moscow, 1966) [in Russian].
5. G. V. Samsonov and I. M. Vinitskii, Handbook of Refractory Compounds (Metallurgiya, Moscow, 1976; Plenum Press, New York, 1980).