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- Language: English
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- Year: 2015
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- Year: 2015
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- Language: English
- Year: 1996
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- Language: English
- Year: 2004
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- Language: English
- Year: 2012
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- Year: 2012
- Author: Johannes Hürter
- Language: German
- Year: 2007
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- Language: English
- Year: 2014