- Author: Francke Hans-Hermann, Ketzel Eberhart, Kotz Hans-Helmut
- Language: German
- Year: 2000
- Author: Francke Hans-Hermann, Ketzel Eberhart
- Language: German
- Year: 1995
- Author: Francke Hans-Hermann, Ketzel Eberhart, Kotz Hans-Helmut
- Language: German
- Year: 1998