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2. G. V. Samsonov et al., Alloys Based on Refractory Compounds [in Russian], Oborongiz (1961).
3. A. M. Cherepanov and S. G. Tresvyatskii, Highly-Refractory Oxide Materials and Parts [in Russian], Metallurgizdat, Moscow (1964).
4. I. S. Kainarskii et al., Ogneupory, No. 4, 175 (1960).
5. N. I. Voronin and N. I. Krasotkina, Ogneupory, No. 5, 41 (1965).