- Author: Hilkert Weddige
- Language: German
- Year: 1997
- Author: Hilkert Weddige
- Language: German
- Year: 2003
- Author: Hilkert Weddige
- Language: German
- Year: 1989
- Author: Hilkert Weddige
- Language: German
- Year: 1989
- Author: Hilkert Weddige
- Language: German
- Year: 2003