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Submitted on: 22 January 2016.
Revised on: 16 April 2016.
Accepted on: 17 May 2016.
___________________ENERGY JOURNAL---INT ASSOC ENERGY ECONOMICS
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Submitted on: 27 August 2017.
Revised on: 25 October 2017.
Accepted on: 12 November 2017.
___________________ENERGY JOURNAL---INT ASSOC ENERGY ECONOMICS
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Submitted on: 25 November 2007.
Revised on: 10 February 2008.
Accepted on: 21 March 2008.
___________________ENERGY JOURNAL---INT ASSOC ENERGY ECONOMICS
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