European Journal of Operational Research
European Journal of Operational Research > 2005 > 160 > 1 > 227-231
European Journal of Operational Research > 2005 > 161 > 3 > 721-735
European Journal of Operational Research > 2005 > 165 > 2 > 387-397
European Journal of Operational Research > 2005 > 165 > 3 > 555-568