Submitted on: 20 November 2008.
Revised on: 11 February 2009.
Accepted on: 21 February 2009.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS A
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Submitted on: 11 February 2006.
Revised on: 09 May 2006.
Accepted on: 23 June 2006.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS A
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Submitted on: 02 December 2012.
Revised on: 11 March 2013.
Accepted on: 16 April 2013.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS A
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Submitted on: 19 January 2004.
Revised on: 23 February 2004.
Accepted on: 17 April 2004.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS A
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Submitted on: 21 May 1999.
Revised on: 16 September 1999.
Accepted on: 01 November 1999.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS A