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Submitted on: 15 August 2023.
Revised on: 25 October 2023.
Accepted on: 18 November 2023.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
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Submitted on: 10 December 2005.
Revised on: 16 February 2006.
Accepted on: 30 March 2006.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
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