- Author: Schulz Axel
- Language: German
- Year: 1978
- Author: Oberender Peter
- Language: German
- Year: 2014
- Author: Behrendt Christian
- Language: German
- Year: 2006
- Author: Harald Graf
- Language: German
- Year: 2014
- Author: Leibniz Gottfried Wilhelm
- Language: German
- Year: 1982
- Author: Lucy Fischer
- Language: English
- Year: 2014