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Submitted on: 01 February 2009.
Revised on: 02 May 2009.
Accepted on: 22 May 2009.
___________________IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
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Submitted on: 29 August 2008.
Revised on: 02 December 2008.
Accepted on: 16 January 2009.
___________________IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS