Submitted on: 10 September 2013.
Revised on: 10 October 2013.
Accepted on: 10 November 2013.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
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Submitted on: 22 February 2002.
Revised on: 26 April 2002.
Accepted on: 01 June 2002.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
Submitted on: 28 December 2017.
Revised on: 27 April 2018.
Accepted on: 23 June 2018.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
Submitted on: 16 April 1998.
Revised on: 15 June 1998.
Accepted on: 09 July 1998.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
Submitted on: 09 December 2014.
Revised on: 08 March 2015.
Accepted on: 01 April 2015.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
Submitted on: 11 September 2004.
Revised on: 03 January 2005.
Accepted on: 13 February 2005.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
Submitted on: 08 November 2022.
Revised on: 21 February 2023.
Accepted on: 13 March 2023.
___________________CURRENT APPLIED PHYSICS---ELSEVIER
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