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Launer, H. F.; Wilson, W. K.; Flynn, J. H.
Journal of Research of the National Bureau of Standards (United States), 1953 , vol. 51, p. 237 - 237
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Nakamori, I.; Takasaki, T.; Hirai, R.
Nippon Kagaku Zasshi, 1957 , vol. 78, p. 771 - 775
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Gmelin Handbook: Cl: SVol.B2, 38, page 397 - 400
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United States of America, Secretary of Commerce
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C. A., 1956 , p. 10994