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Applied Mathematical Modelling > 2013 > 37 > 14-15 > 7883-7887
European Journal of Operational Research > 2007 > 181 > 2 > 733-752
Applied Mathematical Modelling > 2013 > 37 > 14-15 > 7883-7887
European Journal of Operational Research > 2007 > 181 > 2 > 733-752