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Submitted on: 08 February 2003.
Revised on: 08 June 2003.
Accepted on: 26 June 2003.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
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Submitted on: 07 December 2024.
Revised on: 28 February 2025.
Accepted on: 17 April 2025.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
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Submitted on: 13 January 2009.
Revised on: 24 February 2009.
Accepted on: 07 April 2009.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
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Submitted on: 03 March 2005.
Revised on: 29 June 2005.
Accepted on: 13 August 2005.
___________________CURRENT APPLIED PHYSICS---ELSEVIER