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Submitted on: 24 November 2006.
Revised on: 03 March 2007.
Accepted on: 16 March 2007.
___________________International Journal of Computer Mathematics- Computer Systems Theory
Submitted on: 06 August 2014.
Revised on: 07 September 2014.
Accepted on: 09 October 2014.
___________________International Journal of Computer Mathematics- Computer Systems Theory
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Submitted on: 26 December 2002.
Revised on: 26 January 2003.
Accepted on: 12 March 2003.
___________________International Journal of Computer Mathematics- Computer Systems Theory
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Submitted on: 25 May 2017.
Revised on: 17 June 2017.
Accepted on: 04 July 2017.
___________________International Journal of Computer Mathematics- Computer Systems Theory