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Submitted on: 10 July 2003.
Revised on: 12 October 2003.
Accepted on: 10 December 2003.
___________________Journal of Applied Nonlinear Dynamics
Submitted on: 06 June 2016.
Revised on: 01 July 2016.
Accepted on: 26 July 2016.
___________________Journal of Applied Nonlinear Dynamics
Submitted on: 02 July 2007.
Revised on: 10 September 2007.
Accepted on: 25 October 2007.
___________________Journal of Applied Nonlinear Dynamics
Submitted on: 12 September 2007.
Revised on: 31 December 2007.
Accepted on: 07 February 2008.
___________________Journal of Applied Nonlinear Dynamics
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Submitted on: 16 February 1998.
Revised on: 05 April 1998.
Accepted on: 02 June 1998.
___________________Journal of Applied Nonlinear Dynamics