Submitted on: 04 September 1998.
Revised on: 25 September 1998.
Accepted on: 20 October 1998.
___________________Carbon Management---TAYLOR & FRANCIS LTD
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Submitted on: 25 February 2009.
Revised on: 06 June 2009.
Accepted on: 24 June 2009.
___________________Carbon Management---TAYLOR & FRANCIS LTD
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