Submitted on: 09 June 1999.
Revised on: 03 August 1999.
Accepted on: 15 August 1999.
___________________Advances in Differential Equations and Control Processes
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Submitted on: 02 October 2001.
Revised on: 07 December 2001.
Accepted on: 28 December 2001.
___________________Advances in Differential Equations and Control Processes
Submitted on: 29 December 2014.
Revised on: 06 February 2015.
Accepted on: 15 March 2015.
___________________Advances in Differential Equations and Control Processes
Submitted on: 17 December 2021.
Revised on: 09 March 2022.
Accepted on: 21 April 2022.
___________________Advances in Differential Equations and Control Processes
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Submitted on: 09 May 2010.
Revised on: 22 July 2010.
Accepted on: 10 August 2010.
___________________Advances in Differential Equations and Control Processes