Cooper WW, S Kumbhakar, RM Thrall and XL Yu (1978). ?DEA and Stochastic Frontier Analyses.” Socio-Econ Plan Sci 29(2): 85-112.

Cooper WW, S Kumbhakar, RM Thrall and XL Yu (1978). ?DEA and Stochastic Frontier Analyses.” Socio-Econ Plan Sci 29(2): 85-112.

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