Submitted on: 04 March 2020.
Revised on: 17 June 2020.
Accepted on: 05 August 2020.
___________________INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Submitted on: 22 March 2003.
Revised on: 06 May 2003.
Accepted on: 19 June 2003.
___________________INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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Submitted on: 20 October 2005.
Revised on: 23 November 2005.
Accepted on: 08 December 2005.
___________________INTERNATIONAL JOURNAL OF ENERGY RESEARCH