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- Language: German
- Year: 2011
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- Language: English
- Year: 2011
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- Language: German
- Year: 2012
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- Language: German
- Year: 2011
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- Language: German
- Year: 2002
- Author: James S. Walker
- Language: German
- Year: 1994
- Author: Bernd Marx Werner Vogt
- Language: German
- Year: 2010