- Author: Martin A. Guest Claus Hertling
- Language: English
- Year: 2017
- Author: Martin A. Guest
- Language: English
- Year: 1997
- Author: Martin A. Guest
- Language: English
- Year: 2008
- Author: Martin A. Guest
- Language: English
- Year: 2008
- Author: Martin A. Guest
- Language: English
- Year: 2008