European Journal of Operational Research
European Journal of Operational Research > 1997 > 97 > 3 > 561-570
European Journal of Operational Research > 1997 > 98 > 1 > 154-168
European Journal of Operational Research > 1997 > 101 > 3 > 474-485
European Journal of Operational Research > 1997 > 102 > 2 > 264-278