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Submitted on: 06 December 2000.
Revised on: 04 March 2001.
Accepted on: 08 April 2001.
___________________Differential Equations and Dynamical Systems
Submitted on: 11 September 2017.
Revised on: 05 January 2018.
Accepted on: 28 January 2018.
___________________Differential Equations and Dynamical Systems
Submitted on: 03 June 2024.
Revised on: 27 September 2024.
Accepted on: 10 November 2024.
___________________Differential Equations and Dynamical Systems
Submitted on: 11 March 2011.
Revised on: 16 May 2011.
Accepted on: 10 July 2011.
___________________Differential Equations and Dynamical Systems
Submitted on: 07 September 2020.
Revised on: 06 October 2020.
Accepted on: 23 November 2020.
___________________Differential Equations and Dynamical Systems
Submitted on: 09 December 2020.
Revised on: 14 January 2021.
Accepted on: 15 February 2021.
___________________Differential Equations and Dynamical Systems
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