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Submitted on: 19 December 2002.
Revised on: 27 March 2003.
Accepted on: 10 April 2003.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
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Submitted on: 11 April 2017.
Revised on: 30 May 2017.
Accepted on: 17 June 2017.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 10 December 2013.
Revised on: 31 January 2014.
Accepted on: 04 March 2014.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 02 September 2007.
Revised on: 23 December 2007.
Accepted on: 11 January 2008.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 08 October 2003.
Revised on: 23 December 2003.
Accepted on: 02 February 2004.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 14 September 2017.
Revised on: 02 November 2017.
Accepted on: 19 November 2017.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E