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Submitted on: 19 May 2009.
Revised on: 05 August 2009.
Accepted on: 18 August 2009.
___________________Carbon Management---TAYLOR & FRANCIS LTD
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Submitted on: 12 July 2003.
Revised on: 28 October 2003.
Accepted on: 07 December 2003.
___________________Carbon Management---TAYLOR & FRANCIS LTD