- Author: Torsten Neumann
- Language: German
- Year: 2006
- Author: Dipl.-Kfm. Torsten Neumann (auth.)
- Language: German
- Year: 1992
- Author: Dipl.- Kfm. Torsten Neumann (auth.)
- Language: German
- Year: 1992
- Author: Dipl.-Kfm. Torsten Neumann (auth.)
- Language: German
- Year: 1992