Submitted on: 16 April 2002.
Revised on: 06 August 2002.
Accepted on: 10 September 2002.
___________________European Journal of Industrial Engineering
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Submitted on: 04 July 1999.
Revised on: 16 October 1999.
Accepted on: 03 November 1999.
___________________European Journal of Industrial Engineering
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Submitted on: 18 March 2009.
Revised on: 28 May 2009.
Accepted on: 14 June 2009.
___________________European Journal of Industrial Engineering
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Submitted on: 27 April 1998.
Revised on: 30 May 1998.
Accepted on: 05 July 1998.
___________________European Journal of Industrial Engineering
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