Submitted on: 13 October 2015.
Revised on: 21 December 2015.
Accepted on: 14 February 2016.
___________________INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
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Submitted on: 07 February 1999.
Revised on: 11 April 1999.
Accepted on: 22 May 1999.
___________________INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
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