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Submitted on: 17 August 2004.
Revised on: 27 September 2004.
Accepted on: 26 October 2004.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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Submitted on: 23 August 2010.
Revised on: 14 October 2010.
Accepted on: 19 November 2010.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
Submitted on: 25 September 2007.
Revised on: 02 November 2007.
Accepted on: 30 December 2007.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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Submitted on: 21 February 2007.
Revised on: 28 May 2007.
Accepted on: 24 June 2007.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER