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Submitted on: 18 April 2015.
Revised on: 24 May 2015.
Accepted on: 14 July 2015.
___________________EnergyChem---ELSEVIER
Submitted on: 10 October 1999.
Revised on: 14 December 1999.
Accepted on: 28 January 2000.
___________________EnergyChem---ELSEVIER
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Submitted on: 06 April 2009.
Revised on: 04 July 2009.
Accepted on: 21 July 2009.
___________________EnergyChem---ELSEVIER
Submitted on: 26 September 2011.
Revised on: 25 December 2011.
Accepted on: 24 January 2012.
___________________EnergyChem---ELSEVIER
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