Submitted on: 26 April 2003.
Revised on: 04 August 2003.
Accepted on: 26 August 2003.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
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Submitted on: 19 March 2001.
Revised on: 13 May 2001.
Accepted on: 12 July 2001.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
http://reply.papertrans.cn/2/184/18356/18356-34.png
Submitted on: 10 December 2004.
Revised on: 07 February 2005.
Accepted on: 14 March 2005.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER
Submitted on: 20 October 2011.
Revised on: 17 January 2012.
Accepted on: 16 March 2012.
___________________JOURNAL OF NONLINEAR SCIENCE---SPRINGER