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European Journal of Operational Research > 2015 > 241 > 2 > 575-578
European Journal of Operational Research > 2014 > 232 > 2 > 322-329
European Journal of Operational Research > 2015 > 241 > 2 > 575-578
European Journal of Operational Research > 2014 > 232 > 2 > 322-329