European Journal of Operational Research
European Journal of Operational Research > 1999 > 115 > 1 > 195-214
European Journal of Operational Research > 1999 > 118 > 3 > 429-449
European Journal of Operational Research > 1999 > 115 > 1 > 195-214
European Journal of Operational Research > 1999 > 118 > 3 > 429-449