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      JEL-Klassifiezierung
      C54 [2]
      C55 [1]
      C58 [8]
      C6 [1]
      C61 [4]
      C63 [6]
      C67 [2]
      C68 [6]
      C7 [2]
      C70 [1]
      C72 [1]
      C73 [2]
      C81 [2]
      C82 [1]
      C83 [1]
      C90 [2]
      C91 [7]
      C92 [1]
      C93 [1]
      C99 [1]