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Submitted on: 02 September 2019.
Revised on: 22 November 2019.
Accepted on: 19 January 2020.
___________________DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B
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Submitted on: 04 January 2019.
Revised on: 23 April 2019.
Accepted on: 16 May 2019.
___________________DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B
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