Submitted on: 15 June 2009.
Revised on: 29 June 2009.
Accepted on: 06 July 2009.
Scandinavian Journal of Educational Research
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Submitted on: 01 April 2014.
Revised on: 12 April 2014.
Accepted on: 09 May 2014.
Scandinavian Journal of Educational Research
Submitted on: 28 September 1999.
Revised on: 01 November 1999.
Accepted on: 24 November 1999.
Scandinavian Journal of Educational Research