Submitted on: 28 June 2011.
Revised on: 27 July 2011.
Accepted on: 08 September 2011.
___________________Energy Research & Social Science
Submitted on: 13 September 2012.
Revised on: 04 October 2012.
Accepted on: 10 November 2012.
___________________Energy Research & Social Science
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Submitted on: 05 February 1998.
Revised on: 10 March 1998.
Accepted on: 28 April 1998.
___________________Energy Research & Social Science
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Submitted on: 01 April 2007.
Revised on: 06 May 2007.
Accepted on: 24 June 2007.
___________________Energy Research & Social Science
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Submitted on: 20 September 2007.
Revised on: 31 December 2007.
Accepted on: 09 February 2008.
___________________Energy Research & Social Science
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