European Journal of Operational Research
European Journal of Operational Research > 2005 > 162 > 2 > 468-483
European Journal of Operational Research > 2005 > 164 > 3 > 785-791
European Journal of Operational Research > 2005 > 164 > 3 > 800-810
European Journal of Operational Research > 2005 > 164 > 3 > 748-759