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Submitted on: 29 May 2011.
Revised on: 06 August 2011.
Accepted on: 14 September 2011.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Submitted on: 14 May 1998.
Revised on: 02 September 1998.
Accepted on: 19 September 1998.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
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Submitted on: 13 May 2020.
Revised on: 19 June 2020.
Accepted on: 05 August 2020.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
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Submitted on: 10 October 1998.
Revised on: 17 December 1998.
Accepted on: 14 February 1999.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS B
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