参考文献
Acworth, J. J.; Armstrong, H. E.
Journal of the Chemical Society, 1877 , vol. 2, p. 54
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Freer, P. C.; Higley, G. O.
American Chemical Journal, 1893 , vol. 15, p. 71
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Freer, P. C.; Higley, G. O.
American Chemical Journal, 1899 , vol. 21, p. 377
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Higley, G. O.; Davis, W. E.
American Chemical Journal, 1896 , vol. 18, p. 587
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Higley, G. O.
American Chemical Journal, 1895 , vol. 17, p. 18
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Montemartini, C.
Gazzetta Chimica Italiana, 1892 , vol. 22 I, p. 384
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Gmelin Handbook: N: MVol.3, 4.2, page 757 - 764