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- Language: German
- Year: 2007
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- Language: English
- Author: Marcel Bois
- Language: German
- Year: 2015
- Author: Claus Sprick
- Language: German
- Year: 2009
- Author: Rainer Rutz
- Language: German
- Year: 2007
- Author: Gerd Krumeich
- Language: German
- Year: 2004