European Journal of Operational Research
European Journal of Operational Research > 2017 > 257 > 2 > 468-482
European Journal of Operational Research > 2017 > 261 > 2 > 540-548
European Journal of Operational Research > 2017 > 257 > 2 > 468-482
European Journal of Operational Research > 2017 > 261 > 2 > 540-548