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Submitted on: 04 December 2001.
Revised on: 06 February 2002.
Accepted on: 18 February 2002.
___________________COMPUTERS & ELECTRICAL ENGINEERING
Submitted on: 07 January 2001.
Revised on: 07 February 2001.
Accepted on: 08 March 2001.
___________________COMPUTERS & ELECTRICAL ENGINEERING
Submitted on: 29 June 2005.
Revised on: 07 August 2005.
Accepted on: 31 August 2005.
___________________COMPUTERS & ELECTRICAL ENGINEERING
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