2
Published: Bonn, Festland-Verl., 1950-[2017]
   
3
   
5
Published: Bonn, Festland Verlag, [2018]-
   
6
Published: Bonn, Festland-Verl., 2000-[2017]
   
9
Published: Düsseldorf, Econ Verl., 1976
   
10
Published: Stuttgart, Kohlhammer, 1960
   
12
Published: Wiesbaden, VS Verlag für Sozialwissenschaften | GWV Fachverlage GmbH, Wiesbaden, 2006
   

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