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Submitted on: 29 October 2001.
Revised on: 28 January 2002.
Accepted on: 05 March 2002.
___________________INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCE
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Submitted on: 25 May 2007.
Revised on: 27 June 2007.
Accepted on: 06 August 2007.
___________________INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCE
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