Submitted on: 12 June 2005.
Revised on: 20 September 2005.
Accepted on: 24 October 2005.
___________________GIST-Education and Learning Research Journal
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Submitted on: 14 January 2013.
Revised on: 17 April 2013.
Accepted on: 10 May 2013.
___________________GIST-Education and Learning Research Journal
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Submitted on: 28 February 2009.
Revised on: 19 June 2009.
Accepted on: 01 August 2009.
___________________GIST-Education and Learning Research Journal
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Submitted on: 29 January 2018.
Revised on: 11 March 2018.
Accepted on: 21 March 2018.
___________________GIST-Education and Learning Research Journal
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