- Author: Neef Andreas
- Language: German
- Year: 2004
- Author: Lebahn Axel
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- Year: 1976
- Author: Eger Thomas
- Language: German
- Year: 2005
- Author: Braun Johann
- Language: German
- Year: 2022
- Author: Schopenhauer Arthur
- Language: German
- Year: 1978
- Author: Frederick J. McGinness
- Language: English
- Year: 2014