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Submitted on: 25 August 1998.
Revised on: 29 November 1998.
Accepted on: 11 January 1999.
___________________Flexible Services and Manufacturing Journal
Submitted on: 06 November 2005.
Revised on: 06 February 2006.
Accepted on: 04 March 2006.
___________________Flexible Services and Manufacturing Journal
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Submitted on: 26 January 2008.
Revised on: 22 March 2008.
Accepted on: 05 April 2008.
___________________Flexible Services and Manufacturing Journal
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