Olesen OB and NC Petersen (1996). “Indicators of Ill-Conditioned Data Sets and Model Misspecification in Data Envelopment Analysis: An Extended Facet Approach.” Management Science 42(2): 205-219.

Olesen OB and NC Petersen (1996). “Indicators of Ill-Conditioned Data Sets and Model Misspecification in Data Envelopment Analysis: An Extended Facet Approach.” Management Science 42(2): 205-219.

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