2
Published: 2009-
   
3
Published: Bonn, Bundesministerium für Arbeit und Soziales, Referat Information, Monitoring, Bürgerservice, Bibliothek, 2013-
   
4
Published: München, Ifo-Institut, Niederlassung Dresden, 2011-
   
7
Published: Bonn, Bundesministerium für Arbeit und Soziales, 2002-
   

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