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Submitted on: 03 March 2014.
Revised on: 31 March 2014.
Accepted on: 11 April 2014.
___________________European Physical Journal H---SPRINGER HEIDELBERG
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Submitted on: 25 February 2008.
Revised on: 17 March 2008.
Accepted on: 29 March 2008.
___________________European Physical Journal H---SPRINGER HEIDELBERG
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