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Submitted on: 22 November 1998.
Revised on: 22 March 1999.
Accepted on: 20 May 1999.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
Submitted on: 24 August 2010.
Revised on: 12 November 2010.
Accepted on: 24 November 2010.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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Submitted on: 22 March 2008.
Revised on: 12 April 2008.
Accepted on: 10 June 2008.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
Submitted on: 23 October 2017.
Revised on: 15 January 2018.
Accepted on: 02 February 2018.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER