- Author: Dr. Hubert Rehm Dr. Thomas Letzel (auth.)
- Language: German
- Year: 2010
- Author: Hubert Rehm Thomas Letzel (auth.)
- Language: German
- Year: 2016
- Author: Hubert Rehm Thomas Letzel
- Language: German
- Year: 2016
- Author: Hubert Rehm
- Language: English
- Year: 2006
- Author: Hubert Rehm Thomas Letzel
- Language: German
- Year: 2009
- Author: Hubert Rehm
- Language: English
- Year: 2006
- Author: Hubert Rehm
- Language: English
- Year: 2006