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Submitted on: 25 November 2004.
Revised on: 22 March 2005.
Accepted on: 20 April 2005.
___________________APPLIED ENERGY---ELSEVIER SCI LTD
Submitted on: 17 May 2000.
Revised on: 20 July 2000.
Accepted on: 05 September 2000.
___________________APPLIED ENERGY---ELSEVIER SCI LTD
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Submitted on: 19 January 1998.
Revised on: 17 February 1998.
Accepted on: 20 March 1998.
___________________APPLIED ENERGY---ELSEVIER SCI LTD
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Submitted on: 19 March 2005.
Revised on: 09 June 2005.
Accepted on: 07 July 2005.
___________________APPLIED ENERGY---ELSEVIER SCI LTD