- Author: Claus Grupen (auth.)
- Language: German
- Year: 2008
- Author: Claus Grupen (auth.)
- Language: German
- Year: 2018
- Author: Prof. Dr. Claus Grupen (auth.)
- Language: English
- Year: 2005
- Author: Professor Dr. Claus Grupen (auth.)
- Language: German
- Year: 1998
- Author: Claus Grupen (auth.)
- Language: English
- Year: 2010
- Author: Claus Grupen (auth.)
- Language: English
- Year: 2010
- Author: Claus Grupen (auth.)
- Language: German
- Year: 2008
- Author: Claus Grupen (auth.)
- Language: German
- Year: 2008