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Submitted on: 08 December 2012.
Revised on: 01 April 2013.
Accepted on: 27 April 2013.
___________________EUROPEAN PHYSICAL JOURNAL B---SPRINGER
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Submitted on: 14 October 2001.
Revised on: 13 December 2001.
Accepted on: 16 January 2002.
___________________EUROPEAN PHYSICAL JOURNAL B---SPRINGER
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Submitted on: 30 September 2002.
Revised on: 03 December 2002.
Accepted on: 17 January 2003.
___________________EUROPEAN PHYSICAL JOURNAL B---SPRINGER
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Submitted on: 04 August 2007.
Revised on: 04 September 2007.
Accepted on: 20 September 2007.
___________________EUROPEAN PHYSICAL JOURNAL B---SPRINGER