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Submitted on: 07 August 1999.
Revised on: 30 November 1999.
Accepted on: 27 January 2000.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
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Submitted on: 06 November 1999.
Revised on: 09 January 2000.
Accepted on: 01 March 2000.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
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Submitted on: 19 July 2010.
Revised on: 15 September 2010.
Accepted on: 18 October 2010.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
Submitted on: 03 December 2021.
Revised on: 20 February 2022.
Accepted on: 31 March 2022.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY