- Author: Gerhard Dulckeit, Fritz Schwarz, Wolfgang Waldstein
- Language: German
- Year: 1981
- Author: Fritz Schwarz
- Language: English
- Year: 2012
- Author: Fritz Schwarz (auth.)
- Language: English
- Year: 2012
- Author: Fritz Schwarz
- Language: English
- Year: 2007
- Author: Fritz Schwarz
- Language: English
- Year: 2008