Cook WD, M Kress and LM Seiford (1993). “On the Use of Ordinal Data in Data Envelopment Analysis.” JORS 44(2): 133-140.

Cook WD, M Kress and LM Seiford (1993). “On the Use of Ordinal Data in Data Envelopment Analysis.” JORS 44(2): 133-140.

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