Submitted on: 03 April 2021.
Revised on: 21 May 2021.
Accepted on: 29 June 2021.
___________________International Journal of Applied Nonlinear Science
Submitted on: 09 July 2010.
Revised on: 17 October 2010.
Accepted on: 20 November 2010.
___________________International Journal of Applied Nonlinear Science
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