Submitted on: 09 March 2005.
Revised on: 18 March 2005.
Accepted on: 28 March 2005.
Revue des Sciences de l Education
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http://reply.papertrans.cn/3/272/27155/27155-33.png
Submitted on: 03 September 2013.
Revised on: 29 September 2013.
Accepted on: 21 October 2013.
Revue des Sciences de l Education
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