Cook WD, M Kress and LM Sheiford (1996). “Data Envelopment Analysis in the Presence of Both Quantitative and Qualitative Factors.” JORS 47(7): 945-953.

Cook WD, M Kress and LM Sheiford (1996). “Data Envelopment Analysis in the Presence of Both Quantitative and Qualitative Factors.” JORS 47(7): 945-953.

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