1
   
3
Published: Wiesbaden, Statistisches Bundesamt, 1993
   
4
Published: Wiesbaden, Statistisches Bundesamt, 1994
   
6
Published: München [u.a.], Oldenbourg, 1996
   
8
   
9
   
10
   
12
   
17
   
19
Published: Bonn, transcontact Verl.-ges., 1989
   

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