参考文献
Berglund, E.
Acta Universitatis Lundensis, Sectio 2: Medica, Mathematica, Scientiae Rerum Naturalium, 1875 , vol. 12, # 5 p. 1 - 57
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Berglund, E.
Bulletin de la Societe Chimique de France, 1876 , vol. 25, p. 452 - 459
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Gmelin Handbook: S: MVol.B3, 36, page 1606 - 1608