Submitted on: 24 March 2014.
Revised on: 13 June 2014.
Accepted on: 28 June 2014.
___________________International Journal of Computer Mathematics- Computer Systems Theory
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Submitted on: 14 June 2016.
Revised on: 22 August 2016.
Accepted on: 07 September 2016.
___________________International Journal of Computer Mathematics- Computer Systems Theory