Submitted on: 20 November 1999.
Revised on: 08 March 2000.
Accepted on: 14 April 2000.
___________________ENGINEERING OPTIMIZATION---TAYLOR & FRANCIS LTD
Submitted on: 06 October 1999.
Revised on: 09 November 1999.
Accepted on: 09 December 1999.
___________________ENGINEERING OPTIMIZATION---TAYLOR & FRANCIS LTD
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