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2. C. J. Smithells, Tungsten [Russian translation], Moscow, Metallurgizdat (1958).
3. G. I. Abashin and G. M. Pogosyan, Technology of Production of Tungsten and Molybdenum [in Russian], Moscow, Metallurgizdat (1960).
4. W. Espe, Technology of Electronic Materials [Russian translation], Moscow-Leningrad, Gosenergoizdat (1962).
5. A. N. Zelikman, O. E. Krein, and G. V. Samsonov, Metallurgy of Rare Metals [in Russian], Moscow, ?Metallurgiya? Press (1964).