European Journal of Operational Research
European Journal of Operational Research > 2000 > 124 > 3 > 511-528
European Journal of Operational Research > 2004 > 157 > 3 > 620-642
European Journal of Operational Research > 2000 > 124 > 3 > 511-528
European Journal of Operational Research > 2004 > 157 > 3 > 620-642