Submitted on: 28 January 2001.
Revised on: 08 May 2001.
Accepted on: 02 July 2001.
___________________INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
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Submitted on: 10 December 2006.
Revised on: 01 April 2007.
Accepted on: 13 May 2007.
___________________INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
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Submitted on: 14 February 2005.
Revised on: 29 May 2005.
Accepted on: 14 June 2005.
___________________INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
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