Submitted on: 06 September 2014.
Revised on: 12 October 2014.
Accepted on: 28 October 2014.
Proceedings of the Institution of Civil Engineers-Energy
Submitted on: 12 February 2009.
Revised on: 25 February 2009.
Accepted on: 09 March 2009.
Proceedings of the Institution of Civil Engineers-Energy
Submitted on: 02 October 2005.
Revised on: 24 October 2005.
Accepted on: 05 November 2005.
Proceedings of the Institution of Civil Engineers-Energy
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