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Submitted on: 14 January 2000.
Revised on: 25 March 2000.
Accepted on: 07 May 2000.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Submitted on: 06 August 1998.
Revised on: 28 October 1998.
Accepted on: 14 November 1998.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Submitted on: 17 October 2008.
Revised on: 23 December 2008.
Accepted on: 02 February 2009.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Submitted on: 02 June 2010.
Revised on: 21 July 2010.
Accepted on: 07 August 2010.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
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Submitted on: 03 February 2018.
Revised on: 02 March 2018.
Accepted on: 17 April 2018.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
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