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[1]
![](images/www.png) http://www.emeraldinsight.com Last accessed : 2013/08/28
| 2013
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![](images/imprime.png) |
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[2]
![](images/www.png) http://www.csev.org Last accessed : 2014/01/14
| |
![](images/imprime.png) |
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[3]
![](images/www.png) http://edutechdebate.org Last accessed : 2013/05/27
![](images/www.png) French Last accessed : 2014/01/14
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![](images/imprime.png) |
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[4]
![](images/www.png) http://www.hrk.de Last accessed : 2013/08/29
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![](images/imprime.png) |
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[5]
| 2010
|
![](images/imprime.png) |
|