4
   
6
Published: Frankfurt am Main, Fachhochschulverlag, Der Verlag für angewandte Wissenschaften, [2017]
   
9
   
10
   
12
   
13
Published: München, Beck, 2012
   
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17
Published: Baden-Baden, Nomos-Verl.-Ges., 2002
   
18
   

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