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European Journal of Operational Research > 2005 > 164 > 3 > 748-759
European Journal of Operational Research > 1999 > 119 > 2 > 338-344
European Journal of Operational Research > 2005 > 164 > 3 > 748-759
European Journal of Operational Research > 1999 > 119 > 2 > 338-344