Submitted on: 20 October 2000.
Revised on: 24 November 2000.
Accepted on: 10 January 2001.
___________________INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS
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Submitted on: 13 March 2006.
Revised on: 14 May 2006.
Accepted on: 22 June 2006.
___________________INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS
Submitted on: 30 October 2001.
Revised on: 12 January 2002.
Accepted on: 24 January 2002.
___________________INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS
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