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Submitted on: 20 February 2003.
Revised on: 05 April 2003.
Accepted on: 12 April 2003.
PHYSICAL REVIEW E
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Submitted on: 24 September 2010.
Revised on: 26 October 2010.
Accepted on: 16 November 2010.
PHYSICAL REVIEW E---AMER PHYSICAL SOC