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Submitted on: 27 February 2012.
Revised on: 08 June 2012.
Accepted on: 01 July 2012.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 27 June 2003.
Revised on: 23 August 2003.
Accepted on: 18 October 2003.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 31 August 2003.
Revised on: 20 November 2003.
Accepted on: 19 December 2003.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 25 May 2008.
Revised on: 10 August 2008.
Accepted on: 20 September 2008.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 24 February 2011.
Revised on: 21 May 2011.
Accepted on: 17 July 2011.
___________________Communications in Nonlinear Science and Numerical Simulation