8
Published: Bonn, Presse- u. Informationszentrum d. Dt. Bundestages, 1971
   
14
Published: Baden-Baden, Nomos, 2014
   
16
Published: Frankfurt am Main [u.a.], Lang, 1998
   
19
   
20
Published: Köln, O. Schmidt, c 2006
   

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