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Submitted on: 10 June 2009.
Revised on: 04 August 2009.
Accepted on: 22 August 2009.
___________________Carbon Management---TAYLOR & FRANCIS LTD
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Submitted on: 23 October 1999.
Revised on: 21 November 1999.
Accepted on: 07 December 1999.
___________________Carbon Management---TAYLOR & FRANCIS LTD