Submitted on: 13 April 2002.
Revised on: 04 June 2002.
Accepted on: 23 June 2002.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 21 August 2013.
Revised on: 04 October 2013.
Accepted on: 20 November 2013.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 23 January 2006.
Revised on: 28 March 2006.
Accepted on: 22 April 2006.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 14 June 1998.
Revised on: 04 October 1998.
Accepted on: 27 November 1998.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 30 December 2016.
Revised on: 16 March 2017.
Accepted on: 13 April 2017.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 10 May 2001.
Revised on: 06 June 2001.
Accepted on: 25 June 2001.
___________________Communications in Nonlinear Science and Numerical Simulation
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