European Journal of Operational Research
European Journal of Operational Research > 2005 > 165 > 1 > 139-156
European Journal of Operational Research > 2005 > 165 > 3 > 592-597
European Journal of Operational Research > 2005 > 165 > 1 > 139-156
European Journal of Operational Research > 2005 > 165 > 3 > 592-597