European Journal of Operational Research
European Journal of Operational Research > 2005 > 160 > 2 > 457-470
European Journal of Operational Research > 2005 > 160 > 2 > 560-573
European Journal of Operational Research > 2005 > 162 > 1 > 191-205
European Journal of Operational Research > 2005 > 164 > 2 > 301-323