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Submitted on: 17 November 2013.
Revised on: 21 December 2013.
Accepted on: 12 January 2014.
PHYSICS LETTERS B---ELSEVIER
Submitted on: 21 December 2003.
Revised on: 08 January 2004.
Accepted on: 16 January 2004.
PHYSICS LETTERS B
Submitted on: 10 February 2010.
Revised on: 25 February 2010.
Accepted on: 14 March 2010.
PHYSICS LETTERS B---ELSEVIER
Submitted on: 31 January 2011.
Revised on: 20 February 2011.
Accepted on: 06 March 2011.
PHYSICS LETTERS B---ELSEVIER
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Submitted on: 29 August 2008.
Revised on: 03 October 2008.
Accepted on: 09 October 2008.
PHYSICS LETTERS B---ELSEVIER