1
   
3
Published: Wiesbaden, Statistisches Bundesamt, 1993
   
4
Published: Wiesbaden, Statistisches Bundesamt, 1994
   
5
Published: München [u.a.], Oldenbourg, 1996
   
9
   
10
   
11
   
13
   
14
   
20
Published: Bonn, transcontact Verl.-ges., 1989
   

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