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Submitted on: 25 January 2021.
Revised on: 20 February 2021.
Accepted on: 30 March 2021.
___________________Advances in Differential Equations and Control Processes
Submitted on: 14 January 2005.
Revised on: 26 February 2005.
Accepted on: 23 March 2005.
___________________Advances in Differential Equations and Control Processes
Submitted on: 03 September 2008.
Revised on: 04 October 2008.
Accepted on: 23 October 2008.
___________________Advances in Differential Equations and Control Processes
Submitted on: 30 April 2010.
Revised on: 27 May 2010.
Accepted on: 09 June 2010.
___________________Advances in Differential Equations and Control Processes
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Submitted on: 07 April 2005.
Revised on: 21 July 2005.
Accepted on: 06 August 2005.
___________________Advances in Differential Equations and Control Processes