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Submitted on: 25 November 2009.
Revised on: 07 February 2010.
Accepted on: 02 March 2010.
___________________IEEE Journal of the Electron Devices Society
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Submitted on: 18 September 2011.
Revised on: 11 October 2011.
Accepted on: 25 October 2011.
___________________IEEE Journal of the Electron Devices Society
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