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Applied Mathematical Modelling > 2011 > 35 > 8 > 3769-3776
Journal of Productivity Analysis > 2002 > 17 > 1-2 > 49-64
Applied Mathematical Modelling > 2011 > 35 > 8 > 3769-3776
Journal of Productivity Analysis > 2002 > 17 > 1-2 > 49-64