European Journal of Operational Research
European Journal of Operational Research > 1996 > 92 > 2 > 281-301
European Journal of Operational Research > 2006 > 174 > 2 > 874-886
European Journal of Operational Research > 1996 > 92 > 2 > 281-301
European Journal of Operational Research > 2006 > 174 > 2 > 874-886