European Journal of Operational Research
European Journal of Operational Research > 2007 > 182 > 1 > 95-112
European Journal of Operational Research > 2012 > 218 > 2 > 435-441
European Journal of Operational Research > 2007 > 182 > 1 > 95-112
European Journal of Operational Research > 2012 > 218 > 2 > 435-441