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Submitted on: 13 December 2006.
Revised on: 05 April 2007.
Accepted on: 21 May 2007.
___________________Advances in Natural Sciences-Nanoscience and Nanotechnology
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Submitted on: 26 May 2015.
Revised on: 24 July 2015.
Accepted on: 11 August 2015.
___________________Advances in Natural Sciences-Nanoscience and Nanotechnology
Submitted on: 20 February 2012.
Revised on: 30 March 2012.
Accepted on: 22 May 2012.
___________________Advances in Natural Sciences-Nanoscience and Nanotechnology
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Submitted on: 02 August 2000.
Revised on: 22 October 2000.
Accepted on: 12 November 2000.
___________________Advances in Natural Sciences-Nanoscience and Nanotechnology
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