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Submitted on: 17 April 2001.
Revised on: 20 July 2001.
Accepted on: 17 August 2001.
___________________International Journal of Systems Science-Operations & Logistics
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Submitted on: 18 April 2003.
Revised on: 27 July 2003.
Accepted on: 15 August 2003.
___________________International Journal of Systems Science-Operations & Logistics
Submitted on: 25 June 2011.
Revised on: 25 September 2011.
Accepted on: 16 October 2011.
___________________International Journal of Systems Science-Operations & Logistics
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Submitted on: 08 March 1998.
Revised on: 08 May 1998.
Accepted on: 01 June 1998.
___________________International Journal of Systems Science-Operations & Logistics
Submitted on: 14 November 2003.
Revised on: 17 December 2003.
Accepted on: 23 January 2004.
___________________International Journal of Systems Science-Operations & Logistics
Submitted on: 14 April 2014.
Revised on: 14 July 2014.
Accepted on: 04 August 2014.
___________________International Journal of Systems Science-Operations & Logistics