Submitted on: 30 June 2015.
Revised on: 12 October 2015.
Accepted on: 11 November 2015.
___________________DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS
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Submitted on: 06 June 2021.
Revised on: 16 September 2021.
Accepted on: 29 October 2021.
___________________DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS
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