European Journal of Operational Research
European Journal of Operational Research > 2005 > 161 > 1 > 191-202
European Journal of Operational Research > 2005 > 161 > 1 > 86-110
European Journal of Operational Research > 2005 > 161 > 1 > 42-61
European Journal of Operational Research > 2005 > 164 > 1 > 185-194