- Author: Peter Schwieger
- Language: German
- Year: 2006
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- Year: 2015
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- Language: English
- Year: 2021
- Author: Dr. Peter Schwieger
- Language: English
- Year: 2021
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- Language: English
- Year: 2015
- Author: Peter Schwieger
- Language: English
- Year: 2015
- Author: Peter Schwieger
- Language: English
- Year: 2015