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[1]
http://link.springer.com
Last accessed : 2020/02/27
| 2020
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[2]
http://reader.elsevier.com
Last accessed : 2019/01/15
| 2018
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[3]
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[4]
| 2017
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[5]
| 2016
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[6]
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[7]
http://www.tandfonline.com
| 2015
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[8]
http://www.cepii.fr
| 2013
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[9]
http://www.palgrave-journals.com
Last accessed : 2012/10/31
| 2012
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[10]
http://unesdoc.unesco.org
Last accessed : 2012/08/28
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