European Journal of Operational Research
European Journal of Operational Research > 1997 > 98 > 1 > 1-18
European Journal of Operational Research > 1997 > 101 > 3 > 532-549
European Journal of Operational Research > 1997 > 101 > 3 > 509-518
European Journal of Operational Research > 1997 > 101 > 3 > 519-531