- Author: Klaus D. Siemon Ralf Averhaus (auth.)
- Language: German
- Year: 2010
- Author: Klaus D. Siemon (auth.)
- Language: German
- Year: 2010
- Author: Klaus D. Siemon (auth.)
- Language: German
- Year: 2009
- Author: Klaus D. Siemon Ralf Averhaus
- Language: German
- Year: 2018
- Author: Klaus D. Siemon (auth.)
- Language: German
- Year: 2016
- 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 (auth.)
- Language: German
- Year: 2007
- Author: Klaus D. Siemon (auth.)
- Language: German
- Year: 2013