- Author: Voigt Dieter, Mertens Lothar
- Language: German
- Year: 1995
- Author: Voigt Dieter, Mertens Lothar
- Language: German
- Year: 1992
- Author: Voigt Dieter, Mertens Lothar
- Language: German
- Year: 1993
- Author: Mertens Lothar
- Language: German
- Year: 2002
- Author: Mertens Lothar
- Language: German
- Year: 2003
- Author: Mertens Lothar
- Language: German
- Year: 2006
- Author: Mertens Lothar
- Language: German
- Year: 2001
- Author: Mertens Lothar, Voigt Dieter
- Language: German
- Year: 1998
- Author: Mertens Lothar
- Language: German
- Year: 2001
- Author: Mertens Lothar
- Language: German
- Year: 1997