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Submitted on: 01 October 2003.
Revised on: 06 November 2003.
Accepted on: 12 December 2003.
___________________International Journal of Educational Sciences
Submitted on: 02 February 2016.
Revised on: 10 March 2016.
Accepted on: 25 March 2016.
___________________International Journal of Educational Sciences
Submitted on: 18 December 2010.
Revised on: 23 February 2011.
Accepted on: 05 March 2011.
___________________International Journal of Educational Sciences