Number | Date | Country | Kind |
---|---|---|---|
59-193751 | Sep 1984 | JPX | |
59-220073 | Oct 1984 | JPX | |
59-220074 | Oct 1984 | JPX |
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Hampel, "Rare Metals Handbook", Reinhold Pub. Co., N.Y., 1954, pp. 271-280. |
Mellor, "A Comprehensive Treatise on Inorganic & Theoretical Chemistry", vol. 11, 1931, Longmans, Green & Co., N.Y., pp. 512-513. |