- Author: Konzentration, Reiter Bernd
- Language: English
- Year: 2017
- Author: Frank Robert
- Language: English
- Year: 2007
- Author: Zitelmann Rainer
- Language: German
- Year: 2018
- Author: Reich Robert B., Schmid Bernhard
- Language: German
- Year: 2016
- Author: Braun Alexander Michael
- Language: German
- Year: 2016
- Author: García Martínez Antonio
- Language: English
- Year: 2016
- Author: García Martínez Antonio
- Language: English
- Year: 2016
- Author: Eckardt Katja
- Language: German
- Year: 2017
- Author: Eckardt Katja
- Language: German
- Year: 2017
- Author: Cohen Daniel
- Language: English, French
- Year: 1998