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Submitted on: 19 May 2002.
Revised on: 11 September 2002.
Accepted on: 03 October 2002.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
Submitted on: 25 May 2009.
Revised on: 10 July 2009.
Accepted on: 10 August 2009.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
Submitted on: 22 October 2014.
Revised on: 22 January 2015.
Accepted on: 13 February 2015.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
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Submitted on: 18 May 2015.
Revised on: 05 August 2015.
Accepted on: 22 August 2015.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
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Submitted on: 01 April 2004.
Revised on: 24 June 2004.
Accepted on: 06 July 2004.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
Submitted on: 19 February 1999.
Revised on: 09 June 1999.
Accepted on: 25 July 1999.
___________________JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY