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Submitted on: 14 February 1999.
Revised on: 03 April 1999.
Accepted on: 30 May 1999.
___________________Journal of Computational and Nonlinear Dynamics
Submitted on: 10 March 2012.
Revised on: 03 June 2012.
Accepted on: 27 June 2012.
___________________Journal of Computational and Nonlinear Dynamics
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Submitted on: 12 July 1999.
Revised on: 01 October 1999.
Accepted on: 25 November 1999.
___________________Journal of Computational and Nonlinear Dynamics
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