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Submitted on: 08 November 2013.
Revised on: 16 December 2013.
Accepted on: 30 December 2013.
___________________Eurasian Journal of Mathematical and Computer Applications
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Submitted on: 19 January 2000.
Revised on: 10 May 2000.
Accepted on: 24 June 2000.
___________________Eurasian Journal of Mathematical and Computer Applications
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Submitted on: 09 April 2020.
Revised on: 30 July 2020.
Accepted on: 26 August 2020.
___________________Eurasian Journal of Mathematical and Computer Applications
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