Submitted on: 28 March 2017.
Revised on: 13 May 2017.
Accepted on: 16 June 2017.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 28 June 2011.
Revised on: 16 August 2011.
Accepted on: 06 October 2011.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 23 June 2000.
Revised on: 24 August 2000.
Accepted on: 25 September 2000.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 19 April 1999.
Revised on: 30 May 1999.
Accepted on: 23 June 1999.
___________________Communications in Nonlinear Science and Numerical Simulation
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