参考文献
Christensen, O.
Chem. - Tech. Uebers., 1905 , vol. 29, p. 43
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Christensen, O.
Overs. K. Dan. Vidensk. Selsk. Forh., 1904 , p. 397
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Le Blanc; Zellmann
Zeitschrift fuer Elektrochemie, 1923 , vol. 29, p. 183
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Gmelin Handbook: B: MVol., 6.10, page 99 - 103