- Author: Karl-Dieter Tieste Oliver Romberg (auth.)
- Language: German
- Year: 2015
- Author: Oliver Romberg (auth.)
- Language: German
- Year: 2014
- Author: Markus Oestreich Oliver Romberg (auth.)
- Language: German
- Year: 2014
- Author: Markus Oestreich Oliver Romberg (auth.)
- Language: German
- Year: 2010
- Author: Dr. Markus Oestreich Dr. Oliver Romberg (auth.)
- Language: German
- Year: 2009