Submitted on: 11 April 2007.
Revised on: 29 April 2007.
Accepted on: 24 May 2007.
Scandinavian Journal of Educational Research
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Submitted on: 17 May 2019.
Revised on: 05 June 2019.
Accepted on: 19 June 2019.
Scandinavian Journal of Educational Research
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Submitted on: 14 April 2017.
Revised on: 15 May 2017.
Accepted on: 20 May 2017.
Scandinavian Journal of Educational Research
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http://reply.papertrans.cn/3/276/27513/27513-19.png
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