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Submitted on: 20 July 2012.
Revised on: 29 August 2012.
Accepted on: 15 October 2012.
___________________Green Finance---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 10 December 2013.
Revised on: 15 February 2014.
Accepted on: 11 March 2014.
___________________Green Finance---AMER INST MATHEMATICAL SCIENCES-AIMS
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