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Submitted on: 08 June 2002.
Revised on: 14 August 2002.
Accepted on: 10 September 2002.
___________________International Journal of Automation and Computing
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Submitted on: 01 December 1998.
Revised on: 30 December 1998.
Accepted on: 06 February 1999.
___________________International Journal of Automation and Computing
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