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Submitted on: 05 August 2001.
Revised on: 13 November 2001.
Accepted on: 02 December 2001.
___________________COMPUTER-AIDED DESIGN---ELSEVIER SCI LTD
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Submitted on: 25 January 2001.
Revised on: 16 May 2001.
Accepted on: 27 May 2001.
___________________COMPUTER-AIDED DESIGN---ELSEVIER SCI LTD