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Submitted on: 09 April 2000.
Revised on: 05 July 2000.
Accepted on: 13 August 2000.
___________________ADVANCES IN PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 12 February 2002.
Revised on: 20 May 2002.
Accepted on: 05 July 2002.
___________________ADVANCES IN PHYSICS---TAYLOR & FRANCIS LTD
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Submitted on: 03 November 2010.
Revised on: 24 November 2010.
Accepted on: 07 December 2010.
___________________ADVANCES IN PHYSICS---TAYLOR & FRANCIS LTD
Submitted on: 06 August 2007.
Revised on: 30 November 2007.
Accepted on: 11 December 2007.
___________________ADVANCES IN PHYSICS---TAYLOR & FRANCIS LTD
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Submitted on: 13 November 2019.
Revised on: 20 December 2019.
Accepted on: 26 January 2020.
___________________ADVANCES IN PHYSICS---TAYLOR & FRANCIS LTD
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