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      JEL-Klassifiezierung
      C10 [1]
      C13 [2]
      C14 [1]
      C15 [2]
      C16 [2]
      C22 [3]
      C23 [1]
      C31 [1]
      C32 [3]
      C33 [1]
      C35 [2]
      C45 [1]
      C49 [1]
      C51 [4]
      C52 [3]
      C53 [1]
      C54 [2]
      C55 [1]
      C58 [8]
      C6 [1]