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Submitted on: 04 March 2008.
Revised on: 26 June 2008.
Accepted on: 10 July 2008.
___________________Clean Energy---OXFORD UNIV PRESS
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Submitted on: 13 July 2016.
Revised on: 01 October 2016.
Accepted on: 18 November 2016.
___________________Clean Energy---OXFORD UNIV PRESS
Submitted on: 05 February 2016.
Revised on: 25 March 2016.
Accepted on: 17 April 2016.
___________________Clean Energy---OXFORD UNIV PRESS
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