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3. K. D. Morgentbaler, V. Krobn, and G. Eissner, Z. Werkstofftech., No. 10, 276 (1979).
4. E. S. Karakozov et al., Spravoch. Proizvod., No. 11, 8 (1982).
5. I. I. Metelkin et al., Welding of Ceramics with Metals [in Russian], Metallurgiya, Moscow (1977).