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Taken from OR Forum. Published online in Articles in Advance December 13, 2012. 1 with permission from one of the author. For details, one has to see The original paper. Due to extensive mathematical details, the whole paper is Not included. Just Introduction is only reproduced. References are given but they will be actually available in the original paper in OPERATIONS RESEARCH Vol. 61, No. 1, January-February 2013, pp. 1-16 An electronic companion to this paper is available as part of the online version http://dx.doi.org/10.1287/opre .1120.1068.
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