- Author: Gregor Paul
- Language: German
- Year: 2010
- Author: Gregor Paul
- Language: English
- Year: 2023
- Author: Gregor Paul
- Language: English
- Year: 2021
- Author: Gregor Paul
- Language: English
- Year: 2012
- Author: Gregor Paul
- Language: English
- Year: 2020
- Author: Gregor Paul
- Language: English
- Author: Gregor Paul Hoffmann (auth.)
- Language: German
- Year: 2017
- Author: Gregor Paul Hoffmann (auth.)
- Language: German
- Year: 2016