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Submitted on: 27 April 2017.
Revised on: 10 May 2017.
Accepted on: 30 May 2017.
Nano Express---IOP PUBLISHING LTD
Submitted on: 15 January 2006.
Revised on: 29 January 2006.
Accepted on: 05 February 2006.
Nano Express---IOP PUBLISHING LTD
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