- Author: Helmut Degen (auth.)
- Language: German
- Year: 1999
- Author: Ivo Rixen (auth.)
- Language: German
- Year: 1997
- Author: Michael Seidel (auth.)
- Language: German
- Year: 2002
- Author: Andreas Jacobsen (auth.)
- Language: German
- Year: 2000
- Author: Adam Bolek (auth.)
- Language: German
- Year: 1999
- Author: Christoph Kolbeck (auth.)
- Language: German
- Year: 2001
- Author: Katalin Walter (auth.)
- Language: German
- Year: 2002
- Author: Bernd Bitzer (auth.)
- Language: German
- Year: 1990