3
   
6
Published: Wiesbaden, VS, Verl. für Sozialwissenschaften, 2004
   
7
Published: Frankfurt am Main [u.a.], Campus-Verl., 2013
   
8
   
9
Published: Wiesbaden, Statistisches Bundesamt, 2009
   
12
   
19
   
20
   

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