21
Published: Wiesbaden, Gabler, 2001
   
22
Published: St. Augustin, Gesellschaft für Mathematik und Datenverarbeitung, 1979
   
23
Published: Hamburg, GAL-Bürgerschaftsfraktion, 2002
   
24
   
25
Published: Berlin, Heidelberg, Springer Berlin Heidelberg, 2007
   
27
Published: Hamburg, Scriptis Verlag, 2017
   

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