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Submitted on: 24 January 2008.
Revised on: 18 May 2008.
Accepted on: 10 June 2008.
___________________International Journal of Power and Energy Systems
Submitted on: 06 July 2015.
Revised on: 25 September 2015.
Accepted on: 11 November 2015.
___________________International Journal of Power and Energy Systems
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