参考文献
Pfeil, L. B.
J. Iron Steel Inst., London, 1929 , vol. 119 I, p. 501 - 547
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Stead, J. E.
J. Iron Steel Inst., London, 1916 , vol. 94, # II p. 243 - 248
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Gmelin Handbook: Ni: MVol.AI, 10.1, page 603 - 609