von Hirschhausen C, A Cullmann and A Kappeler (2006). “Efficiency Analysis of German Electricity Distribution Utilities – Non-Parametric and Parametric Tests.” Appl Econ 38(21): 2553-2566.

von Hirschhausen C, A Cullmann and A Kappeler (2006). “Efficiency Analysis of German Electricity Distribution Utilities – Non-Parametric and Parametric Tests.” Appl Econ 38(21): 2553-2566.

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