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Submitted on: 06 September 2012.
Revised on: 18 October 2012.
Accepted on: 08 December 2012.
___________________Journal of Photonics for Energy
Submitted on: 25 November 1999.
Revised on: 02 February 2000.
Accepted on: 29 March 2000.
___________________Journal of Photonics for Energy
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