3
   
6
   
7
Published: Lüneburg, Forschungsinst. Freie Berufe, Univ. Lüneburg, 1991
   
11
   
12
   
14
   
15
Published: Stuttgart [u.a.], Kohlhammer, 1995
   
17
Published: Bremerhaven, Wirtschaftsverl. NW, Verl. für Neue Wiss., 1999
   

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