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- Language: German
- Year: 2001
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- Language: German
- Year: 2000
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- Language: German
- Year: 2009
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- Language: German
- Year: 2003
- Author: Minssen Heiner, Molsich Beate, Wilkesmann Uwe, Andersen Uwe
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- Year: 2003
- Author: Liefner Ingo
- Language: German
- Year: 2001