European Journal of Operational Research
European Journal of Operational Research > 2005 > 160 > 2 > 416-422
European Journal of Operational Research > 2005 > 161 > 1 > 62-72
European Journal of Operational Research > 2005 > 161 > 1 > 73-85
European Journal of Operational Research > 2005 > 163 > 2 > 418-433
European Journal of Operational Research > 2005 > 167 > 1 > 77-95