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Submitted on: 15 July 2010.
Revised on: 25 October 2010.
Accepted on: 25 November 2010.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 25 June 1998.
Revised on: 18 September 1998.
Accepted on: 12 November 1998.
___________________Communications in Nonlinear Science and Numerical Simulation
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Submitted on: 15 December 2000.
Revised on: 27 February 2001.
Accepted on: 06 April 2001.
___________________Communications in Nonlinear Science and Numerical Simulation
Submitted on: 05 April 1998.
Revised on: 20 June 1998.
Accepted on: 11 August 1998.
___________________Communications in Nonlinear Science and Numerical Simulation