• 

  GS1 Germany Glossar

  https://web.archive.org/web/20100705103043/http://www.gs1-germany.de/glossar

  Keine Beschreibung vorhanden.

• 

  Journal for Labour Market Research | IAB

  http://www.iab.de/196/section.aspx/Jahrgang/2012

  Informationen zur

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