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Submitted on: 04 June 2006.
Revised on: 26 September 2006.
Accepted on: 21 October 2006.
___________________IEEE TRANSACTIONS ON NANOTECHNOLOGY
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Submitted on: 27 March 2008.
Revised on: 09 July 2008.
Accepted on: 24 July 2008.
___________________IEEE TRANSACTIONS ON NANOTECHNOLOGY