European Journal of Operational Research
European Journal of Operational Research > 2012 > 220 > 1 > 182-186
European Journal of Operational Research > 2012 > 220 > 1 > 125-131
European Journal of Operational Research > 2012 > 220 > 1 > 182-186
European Journal of Operational Research > 2012 > 220 > 1 > 125-131