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Submitted on: 18 September 2000.
Revised on: 14 October 2000.
Accepted on: 30 October 2000.
___________________Decision Analysis---INFORMS
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Submitted on: 07 June 2011.
Revised on: 13 July 2011.
Accepted on: 03 September 2011.
___________________Decision Analysis---INFORMS
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