- Author: Selmer Peter, Gersdorf Hubertus
- Language: German
- Year: 1994
- Author: Gersdorf Hubertus
- Language: German
- Year: 1991
- Author: Gersdorf Hubertus
- Language: German
- Year: 2008
- Author: Gersdorf Hubertus
- Language: German
- Year: 2015
- Author: Gersdorf Hubertus
- Language: German
- Year: 2007