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Submitted on: 07 July 2007.
Revised on: 23 October 2007.
Accepted on: 20 December 2007.
___________________Beilstein Journal of Nanotechnology
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Submitted on: 17 June 2005.
Revised on: 07 October 2005.
Accepted on: 26 November 2005.
___________________Beilstein Journal of Nanotechnology