- Author: Otto Kaiser, Hans-Peter Müller, James Alfred Loader
- Language: German
- Year: 2017
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- Language: German
- Year: 2009
- Author: Jan Christian Gertz
- Language: German
- Year: 2018
- Author: Arnold Huijgen
- Language: German
- Year: 2011
- Author: Matthias Rein
- Language: German
- Year: 2012
- Author: Ralf Pröve, Carmen Winkel
- Language: German
- Year: 2012
- Author: Beate Hintzen
- Language: German
- Year: 2015
- Author: Laurenz Lütteken, Wolfgang Sandberger
- Language: German
- Year: 2015