Charnes A and RM Thrall (1991). “A Structure for Classifying and Characterizing Efficiency and Inefficiency in Data Envelopment Analysis.” JPA 2: 197-237.

Charnes A and RM Thrall (1991). “A Structure for Classifying and Characterizing Efficiency and Inefficiency in Data Envelopment Analysis.” JPA 2: 197-237.

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