- Author: Klaus D. Siemon Ralf Averhaus (auth.)
- Language: German
- Year: 2010
- Author: Klaus D. Siemon Ralf Averhaus (auth.)
- Language: German
- Year: 2012
- Author: Klaus D. Siemon Ralf Averhaus (auth.)
- Language: German
- Year: 2014
- Author: Klaus D. Siemon Ralf Averhaus (auth.)
- Language: German
- Year: 2010