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Submitted on: 18 May 2007.
Revised on: 26 May 2007.
Accepted on: 23 June 2007.
PHYSICA D-NONLINEAR PHENOMENA
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Submitted on: 25 July 2002.
Revised on: 30 August 2002.
Accepted on: 04 September 2002.
PHYSICA D-NONLINEAR PHENOMENA---ELSEVIER