Submitted on: 27 September 2014.
Revised on: 04 November 2014.
Accepted on: 24 December 2014.
___________________ASIA-PACIFIC JOURNAL OF OPERATIONAL RESEARCH
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Submitted on: 21 May 2016.
Revised on: 14 September 2016.
Accepted on: 24 September 2016.
___________________ASIA-PACIFIC JOURNAL OF OPERATIONAL RESEARCH
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Submitted on: 24 October 2009.
Revised on: 13 February 2010.
Accepted on: 05 March 2010.
___________________ASIA-PACIFIC JOURNAL OF OPERATIONAL RESEARCH
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