参考文献
Busse, W. F.; Daniels, F.
Journal of the American Chemical Society, 1927 , vol. 49, p. 1261
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Sprenger, G.
Z. phys. Ch., 1928 , vol. 136, p. 55
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Gmelin Handbook: N: MVol.3, 2.5.3, page 725 - 729
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Gmelin Handbook: N: MVol.3, 4.2, page 757 - 764
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Gmelin Handbook: N: MVol.3, 5.3, page 825 - 837