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Submitted on: 14 December 2016.
Revised on: 23 January 2017.
Accepted on: 12 February 2017.
PHYSICS LETTERS B---ELSEVIER
Submitted on: 08 August 2015.
Revised on: 30 August 2015.
Accepted on: 15 September 2015.
PHYSICS LETTERS B
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Submitted on: 07 January 2015.
Revised on: 26 January 2015.
Accepted on: 21 February 2015.
PHYSICS LETTERS B
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Submitted on: 26 May 2006.
Revised on: 07 June 2006.
Accepted on: 28 June 2006.
PHYSICS LETTERS B---ELSEVIER
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