4
Published: Bonn, Stotax, Stollfuß Medien, 2001-
   
5
Published: Wiesbaden, Dt. Univ.-Verl. [u.a.], 2000
   
6
   
20
Published: [Herne] [u.a.], Verl. Neue Wirtschafts-Briefe, 2007
   

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