参考文献
Feild, A. L.
Transactions of the Faraday Society, 1925 , vol. 21, p. 259 - 259
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Herty, C. H. jr.; Christopher, C. F.; Steward, R. W.
Min. metallurg. Investigations Bl., 1930 , # 38 p. 165 - 165
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Gmelin Handbook: Fe: MVol.A5, 6, page 878 - 881