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Submitted on: 25 September 1999.
Revised on: 15 December 1999.
Accepted on: 01 January 2000.
___________________International Journal of Greenhouse Gas Control
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Submitted on: 30 October 2007.
Revised on: 10 December 2007.
Accepted on: 25 December 2007.
___________________International Journal of Greenhouse Gas Control
Submitted on: 09 April 2004.
Revised on: 06 July 2004.
Accepted on: 02 September 2004.
___________________International Journal of Greenhouse Gas Control
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Submitted on: 11 December 2002.
Revised on: 03 April 2003.
Accepted on: 23 May 2003.
___________________International Journal of Greenhouse Gas Control