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Source:
Interfaces. March-April 2002, Vol. 32 Issue 2, p56, 7p.
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Source:
The Economist. February 3, 2007, Vol. 382 Issue 8514, p79.
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Source:
Management Science. April 1983, Vol. 29 Issue 4 p455-464 table
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Source:
The Economist. August 24, 1996, Vol. 340 Issue 7980, p45, 1p.
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