Submitted on: 16 September 2005.
Revised on: 04 January 2006.
Accepted on: 24 January 2006.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 05 November 2010.
Revised on: 24 February 2011.
Accepted on: 14 March 2011.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 30 November 2003.
Revised on: 01 January 2004.
Accepted on: 22 February 2004.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 12 June 2019.
Revised on: 06 August 2019.
Accepted on: 16 September 2019.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 15 November 2018.
Revised on: 11 March 2019.
Accepted on: 26 April 2019.
___________________Communications in Nonlinear Science and Numerical Simulation