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- Language: English
- Year: 2020

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- Language: English
- Year: 2020

- Author: Mehran Maghsoudi
- Language: English
- Year: 2021

- Author: Eric Gilli
- Language: English
- Year: 2021

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- Language: German
- Year: 2020

- Author: Martin Okrusch Hartwig E. Frimmel
- Language: English
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- Author: Andreas Schäfer
- Language: German
- Year: 2019

- Author: Willi Freeden
- Language: German, English
- Year: 2020