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Submitted on: 13 January 2002.
Revised on: 27 February 2002.
Accepted on: 23 March 2002.
___________________EnergyChem---ELSEVIER
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Submitted on: 13 October 2018.
Revised on: 22 November 2018.
Accepted on: 08 January 2019.
___________________EnergyChem---ELSEVIER
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Submitted on: 25 May 1998.
Revised on: 29 June 1998.
Accepted on: 09 August 1998.
___________________EnergyChem---ELSEVIER
Submitted on: 23 February 2007.
Revised on: 10 June 2007.
Accepted on: 05 August 2007.
___________________EnergyChem---ELSEVIER