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Submitted on: 12 December 2010.
Revised on: 06 April 2011.
Accepted on: 22 May 2011.
___________________EUROPEAN PHYSICAL JOURNAL D---SPRINGER
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Submitted on: 25 July 2020.
Revised on: 04 October 2020.
Accepted on: 29 November 2020.
___________________EUROPEAN PHYSICAL JOURNAL D---SPRINGER
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