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- Language: German
- Year: 2013
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- Year: 2015
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- Language: English
- Year: 2015
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- Language: English
- Year: 2015
- Author: Wolfgang Eichholz, Eberhard Vilkner
- Language: German
- Year: 2013
- Author: Felipe Wolff-Fabris
- Language: English
- Year: 2010
- Author: Michael Knorrenschild
- Language: German
- Year: 2013