European Journal of Operational Research
European Journal of Operational Research > 1997 > 102 > 2 > 264-278
European Journal of Operational Research > 1998 > 106 > 2-3 > 336-356
European Journal of Operational Research > 2002 > 138 > 1 > 87-102
European Journal of Operational Research > 2005 > 165 > 1 > 139-156