- Author: Peter Gemeinhardt
- Language: German
- Year: 2014
- Author: Eleni Pachoumi
- Language: English
- Year: 2017
- Author: Eva Baumkamp
- Language: German
- Year: 2014
- Author: Andreas Heiser
- Language: German
- Year: 2012
- Author: Michael Jonas
- Language: German
- Year: 2015
- Author: Daniele Pevarello
- Language: English
- Year: 2013