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  • p352_1)
    V. v. Lang, Wied. Ann. 16. p. 337. 1882.
  • p352_2)
    F. Kohlrausch, Wied. Ann. 4. p. 3. 1878.
  • p352_3)
    l. c. p. 27.
  • p352_4)
    Ketteler, Carl's Rep. 16. p. 264. 1880.