Submitted on: 21 July 2004.
Revised on: 27 August 2004.
Accepted on: 27 September 2004.
___________________Journal of Physics-Energy---IOP PUBLISHING LTD
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Submitted on: 30 January 2007.
Revised on: 19 May 2007.
Accepted on: 13 June 2007.
___________________Journal of Physics-Energy---IOP PUBLISHING LTD
Submitted on: 01 October 2011.
Revised on: 12 December 2011.
Accepted on: 23 December 2011.
___________________Journal of Physics-Energy---IOP PUBLISHING LTD
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