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3. Zhemchuzhina, E.A. and Belyaev, A.I., Tsvetnaya Metallurgiya, No. 5, 1961, pp. 123.
4. Derge, G. and Shegog, J.R., Light Metals, Vol. 1, 1973, pp. 135; pub. TMS-AIME.
5. JANAF Thermochemical Tables, 2nd Ed., NSRDS--NBS 37.