Ray SC (1988). “Data Envelopment Analysis, Nondiscretionary Inputs and Efficiency: An Alternative Interpretation.” Socio-Econ Plan Sci 2: 167-176.

Ray SC (1988). “Data Envelopment Analysis, Nondiscretionary Inputs and Efficiency: An Alternative Interpretation.” Socio-Econ Plan Sci 2: 167-176.

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