2
Published: Erfurt, Fachhochsch., Fachbereich Wirtschaftswiss., 2011
   
6
   
7
Published: Berlin, Heidelberg, Springer-Verlag Berlin Heidelberg, 2010
   
8
   
10
   
15
Published: Erfurt, Fachhochsch., Fachbereich Wirtschaftswiss., 2012
   
17
Published: Wiesbaden, Gabler, 2008
   
19
   

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