Submitted on: 24 October 2008.
Revised on: 30 November 2008.
Accepted on: 28 December 2008.
___________________EnergyChem---ELSEVIER
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Submitted on: 09 February 2002.
Revised on: 06 March 2002.
Accepted on: 01 May 2002.
___________________EnergyChem---ELSEVIER
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