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- Language: German
- Year: 2011

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- Language: German
- Year: 2011

- Author: Gunter Erhard
- Language: English
- Year: 2005

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- Language: English
- Year: 2012

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- Language: German
- Year: 2013

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- Language: German
- Year: 2007

- Author: V. Quaschning
- Language: German
- Year: 2011

- Author: Osswald T.A. Hernandez-Ortiz J.P.
- Language: English
- Year: 2006