Submitted on: 25 August 2013.
Revised on: 16 October 2013.
Accepted on: 23 November 2013.
___________________International Journal of Computing Science and Mathematics
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Submitted on: 04 July 2015.
Revised on: 28 August 2015.
Accepted on: 18 September 2015.
___________________International Journal of Computing Science and Mathematics
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Submitted on: 09 September 2022.
Revised on: 07 December 2022.
Accepted on: 27 January 2023.
___________________International Journal of Computing Science and Mathematics