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Submitted on: 13 November 2001.
Revised on: 18 January 2002.
Accepted on: 13 February 2002.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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Submitted on: 19 May 2007.
Revised on: 30 August 2007.
Accepted on: 25 September 2007.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
Submitted on: 30 September 2013.
Revised on: 11 January 2014.
Accepted on: 08 February 2014.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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http://reply.papertrans.cn/2/184/18356/18356-28.png
Submitted on: 31 October 1999.
Revised on: 22 January 2000.
Accepted on: 11 March 2000.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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