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[1]
| 2018
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[2]
| 2017
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[3]
| 2016
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[4]
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[5]
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[6]
![](images/www.png) http://www.scirp.org Last accessed : 2016/03/23
| 2015
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[7]
![](images/www.png) http://publicaciones.anuies.mx Last accessed : 2014/10/16
| 2014
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[8]
![](images/www.png) http://www.udual.org Last accessed : 2014/09/24
| 2013
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[9]
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[10]
![](images/www.png) http://knowledge.cta.int Last accessed : 2012/08/08
| 2012
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