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X-Efficiency and Technical Efficiency.
Button, Kenneth J, (1994)
Cost Functions and Cost Efficiency in Electricity Distribution: A Stochastic Frontier Approach.
Burns, Philip, (1996)
Productive and Allocative Inefficiencies in U.K. Building Societies: A Comparison of Non-parametric and Stochastic Frontier Techniques.
Drake, Leigh, (1996)