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Submitted on: 26 August 2010.
Revised on: 05 October 2010.
Accepted on: 09 November 2010.
___________________Journal of Physics-Materials---IOP PUBLISHING LTD
Submitted on: 24 March 2010.
Revised on: 13 May 2010.
Accepted on: 06 July 2010.
___________________Journal of Physics-Materials---IOP PUBLISHING LTD
Submitted on: 23 September 2014.
Revised on: 12 January 2015.
Accepted on: 27 January 2015.
___________________Journal of Physics-Materials---IOP PUBLISHING LTD
Submitted on: 03 May 2011.
Revised on: 25 August 2011.
Accepted on: 16 October 2011.
___________________Journal of Physics-Materials---IOP PUBLISHING LTD
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