Submitted on: 10 February 2011.
Revised on: 03 April 2011.
Accepted on: 06 May 2011.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 01 April 2011.
Revised on: 11 July 2011.
Accepted on: 30 August 2011.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 09 June 2020.
Revised on: 05 September 2020.
Accepted on: 18 October 2020.
___________________Communications in Nonlinear Science and Numerical Simulation
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