European Journal of Operational Research
European Journal of Operational Research > 1998 > 106 > 2-3 > 336-356
European Journal of Operational Research > 1998 > 109 > 2 > 264-285
European Journal of Operational Research > 1998 > 106 > 2-3 > 336-356
European Journal of Operational Research > 1998 > 109 > 2 > 264-285