- Author: Robert Denk
- Language: German
- Year: 2023
- Author: Robert Denk
- Language: German
- Year: 2023
- Author: Robert Denk Mario Kaip
- Language: English
- Year: 2013
- Author: Robert Denk Matthias Hieber Jan Pruss
- Language: English
- Year: 2003
- Author: Robert Denk Mario Kaip (auth.)
- Language: English
- Year: 2013