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Submitted on: 07 April 2008.
Revised on: 01 June 2008.
Accepted on: 11 July 2008.
___________________EPJ Applied Metamaterials---EDP SCIENCES S A
Submitted on: 01 March 2015.
Revised on: 09 May 2015.
Accepted on: 27 May 2015.
___________________EPJ Applied Metamaterials---EDP SCIENCES S A
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