- Author: Kleffner Thomas
- Language: German
- Year: 1994
- Author: Kern Bernd-Rüdiger
- Language: German
- Year: 2000
- Author: Kainz Martin
- Language: German
- Year: 1984
- Author: Gaedtke Jens-Christian
- Language: German
- Year: 2006
- Author: Dusowski Anne
- Language: German
- Year: 2004
- Author: Bülck Hartwig
- Language: German
- Year: 1984
- Author: Begert Alexander
- Language: German
- Year: 2010