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Submitted on: 22 June 2001.
Revised on: 14 October 2001.
Accepted on: 08 December 2001.
___________________International Journal of Computational Intelligence and Applications
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Submitted on: 20 December 2013.
Revised on: 17 January 2014.
Accepted on: 03 February 2014.
___________________International Journal of Computational Intelligence and Applications
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