- Author: Peter Clote Rolf Backofen
- Language: English
- Year: 2000
- Author: Peter Clote Rolf Backofen
- Language: English
- Year: 2000
- Author: Robert Stephen Cantrell Chris Cosner
- Language: English
- Year: 2003
- Author: Peter Clote Rolf Backofen
- Language: English
- Year: 2000