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Submitted on: 24 October 2005.
Revised on: 25 November 2005.
Accepted on: 15 January 2006.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 10 May 2006.
Revised on: 28 June 2006.
Accepted on: 16 August 2006.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 31 March 2018.
Revised on: 12 July 2018.
Accepted on: 01 September 2018.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 02 October 1999.
Revised on: 15 November 1999.
Accepted on: 07 December 1999.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 31 May 2003.
Revised on: 22 August 2003.
Accepted on: 30 September 2003.
___________________Communications in Nonlinear Science and Numerical Simulation