Submitted on: 22 April 2005.
Revised on: 29 July 2005.
Accepted on: 09 September 2005.
___________________ADVANCES IN COMPLEX SYSTEMS---WORLD SCIENTIFIC PUBL CO PTE LTD
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Submitted on: 29 September 2003.
Revised on: 20 October 2003.
Accepted on: 28 November 2003.
___________________ADVANCES IN COMPLEX SYSTEMS---WORLD SCIENTIFIC PUBL CO PTE LTD
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