Submitted on: 24 February 1998.
Revised on: 17 April 1998.
Accepted on: 14 June 1998.
___________________International Energy Journal---REGIONAL ENERGY RESOURCES INFO CENTER
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Submitted on: 11 July 1998.
Revised on: 04 November 1998.
Accepted on: 27 December 1998.
___________________International Energy Journal---REGIONAL ENERGY RESOURCES INFO CENTER
Submitted on: 21 April 2006.
Revised on: 06 August 2006.
Accepted on: 30 September 2006.
___________________International Energy Journal---REGIONAL ENERGY RESOURCES INFO CENTER
Submitted on: 05 October 2020.
Revised on: 01 February 2021.
Accepted on: 16 March 2021.
___________________International Energy Journal---REGIONAL ENERGY RESOURCES INFO CENTER
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Submitted on: 09 May 2018.
Revised on: 03 June 2018.
Accepted on: 01 August 2018.
___________________International Energy Journal---REGIONAL ENERGY RESOURCES INFO CENTER
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