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IEEE Transactions on Engineering Management > 2007 > 54 > 4 > 716 - 728
Journal of Econometrics > 1995 > 65 > 1 > 9-43
IEEE Transactions on Engineering Management > 2007 > 54 > 4 > 716 - 728
Journal of Econometrics > 1995 > 65 > 1 > 9-43