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European Journal of Operational Research > 2002 > 137 > 3 > 657-676
European Journal of Operational Research > 2001 > 130 > 1 > 156-168
European Journal of Operational Research > 2002 > 137 > 3 > 657-676
European Journal of Operational Research > 2001 > 130 > 1 > 156-168