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Submitted on: 27 June 1998.
Revised on: 02 October 1998.
Accepted on: 02 November 1998.
___________________EPJ Applied Metamaterials---EDP SCIENCES S A
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Submitted on: 21 April 2012.
Revised on: 01 July 2012.
Accepted on: 28 August 2012.
___________________EPJ Applied Metamaterials---EDP SCIENCES S A
Submitted on: 01 August 2023.
Revised on: 09 November 2023.
Accepted on: 05 January 2024.
___________________EPJ Applied Metamaterials---EDP SCIENCES S A
Submitted on: 23 April 2016.
Revised on: 16 August 2016.
Accepted on: 13 September 2016.
___________________EPJ Applied Metamaterials---EDP SCIENCES S A
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