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Submitted on: 21 March 1998.
Revised on: 07 July 1998.
Accepted on: 25 August 1998.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 16 January 2016.
Revised on: 11 March 2016.
Accepted on: 26 March 2016.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 26 November 2013.
Revised on: 20 March 2014.
Accepted on: 05 April 2014.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 30 July 2010.
Revised on: 22 November 2010.
Accepted on: 02 January 2011.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 22 July 2000.
Revised on: 05 October 2000.
Accepted on: 20 October 2000.
___________________Communications in Nonlinear Science and Numerical Simulation