Submitted on: 08 January 2013.
Revised on: 28 April 2013.
Accepted on: 18 May 2013.
___________________Energy---PERGAMON-ELSEVIER SCIENCE LTD
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Submitted on: 16 February 2008.
Revised on: 02 April 2008.
Accepted on: 07 May 2008.
___________________Energy---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 20 July 1998.
Revised on: 01 September 1998.
Accepted on: 08 October 1998.
___________________Energy---PERGAMON-ELSEVIER SCIENCE LTD
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