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3. E. M. Levin, C. R. Robbins andH. F. McMurdie, ?Phase Diagrams for Ceramists? (American Ceramic Society, Columbus, Ohio, 1964) p. 40.
4. B. C. H. Steels, in ?Electromotive Force Measurements in High Temperature Systems?, edited by C. B. Alcock (Institute of Mining and Metallurgy, London, 1968) p. 21.
5. L. Brewer, R. H. Lamoreaux, R. Ferro, R. Marazza andK. Girgis, ?Molybdenum: Physicochemical Properties of its Compounds and Alloys? (Atomic Energy Review Agency, Vienna, 1980) pp. 30?285.