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- Language: English
- Year: 2018

- Author: Jon Butler Bruno Vincent
- Language: English
- Year: 2007

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- Year: 2018

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- Year: 2018

- Author: Brian Clegg
- Language: English
- Year: 2017

- Author: Lütfü Şimşek Dimitri Gutas
- Language: Turkish
- Year: 2015

- Author: National Academy of Sciences
- Language: English
- Year: 2004

- Author: William M. Rand
- Language: English
- Year: 1991