- Author: Boer Roland, Petterson Christina
- Language: English
- Year: 2014
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- Language: English
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- Author: Boer Roland
- Language: English
- Year: 2019
- Author: Boer Roland
- Language: English
- Year: 2015
- Author: Marx Karl, Marx Karl, Boer Roland
- Language: English
- Year: 2014
- Author: Boer Roland
- Language: English
- Year: 2007
- Author: Boer Roland
- Language: English
- Year: 2009
- Author: Boer Roland
- Language: English
- Year: 2011