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Submitted on: 20 January 2009.
Revised on: 05 February 2009.
Accepted on: 24 February 2009.
Results in Physics
Submitted on: 19 May 2004.
Revised on: 12 June 2004.
Accepted on: 09 July 2004.
Results in Physics---ELSEVIER
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Submitted on: 24 January 2001.
Revised on: 10 February 2001.
Accepted on: 07 March 2001.
Results in Physics---ELSEVIER
Submitted on: 25 October 2019.
Revised on: 06 December 2019.
Accepted on: 01 January 2020.
Results in Physics---ELSEVIER
Submitted on: 17 October 2018.
Revised on: 09 November 2018.
Accepted on: 05 December 2018.
Results in Physics
Submitted on: 30 June 2010.
Revised on: 01 August 2010.
Accepted on: 24 August 2010.
Results in Physics---ELSEVIER
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