- Author: Siegfried Neumann
- Language: German
- Year: 1971
- Author: Siegfried Neumann
- Language: German
- Year: 1975
- Author: Siegfried Neumann
- Language: German
- Year: 1980
- Author: Siegfried Neumann
- Language: German
- Year: 1979
- Author: A. Pingoud (auth.) Professor Dr. Christoph Wagener Dr. Siegfried Neumann (eds.)
- Language: English
- Year: 1993