- Author: Seiffert Johannes
- Language: German
- Year: 2014
- Author: Herbert Gutschera Joachim Maier Jörg Thierfelder
- Language: German
- Year: 2016
- Author: Bernd Jochen Hilberath Peter Hünermann
- Language: German
- Year: 2006
- Author: Markus Knapp
- Language: German
- Year: 2009