参考文献
Coppadoro, A.
Gazzetta Chimica Italiana, 1913 , vol. 43, # I p. 142
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Findlay, A.; Cruickshank, J.
Journal of the Chemical Society, 1926 , vol. 129, p. 317
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Gmelin Handbook: Ba: MVol., 7.8, page 209 - 213