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- Language: German

- Author: Ramge Thomas, Familie Flick
- Language: German
- Year: 2015

- Author: Osterloh Jörg, Rauschenberger Katharina
- Language: German
- Year: 2017

- Author: Kommer Gerd
- Language: German
- Year: 2018

- Author: Bayer Michael, Darwin John, Juraschitz Norbert
- Language: German
- Year: 2017

- Author: Jürgen Zimmerer
- Language: German
- Year: 2014

- Author: Fredmund Malik
- Language: German
- Year: 2006