Thrall RM (1989). “Classification Transitions under Expansion of Inputs and Outputs in Data Envelopment Analysis.” Managerial and Decision Economics 10(2): 159-162.

Thrall RM (1989). “Classification Transitions under Expansion of Inputs and Outputs in Data Envelopment Analysis.” Managerial and Decision Economics 10(2): 159-162.

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