- Author: Jitske Kramer
- Language: English
- Year: 2021
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- Language: English
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- Language: English
- Year: 2018
- Author: Osabuohien P Amienyi
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- Year: 2005
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- Year: 2016
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- Language: English
- Year: 2015
- Author: Robert O'Brien
- Language: English
- Year: 2008
- Author: Yaakov Kop, Robert E. Litan
- Language: English
- Year: 2002
- Author: Karen Fog Olwig, Karsten Pærregaard
- Language: English
- Year: 2011