Ray SC and HJ Kim (1995). “Cost Efficiency in the United-States Steel-Industry – a Nonparametric Analysis Using Data Envelopment Analysis.” EJOR 8: 654-671.

Ray SC and HJ Kim (1995). “Cost Efficiency in the United-States Steel-Industry – a Nonparametric Analysis Using Data Envelopment Analysis.” EJOR 8: 654-671.

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