Zhang Y and R Bartels (1998). “The Effect of Sample Size on the Mean Efficiency in DEA with an Application to Electricity Distribution in Australia, Sweden and New Zealand.” JPA 9(3): 205-232.

Zhang Y and R Bartels (1998). “The Effect of Sample Size on the Mean Efficiency in DEA with an Application to Electricity Distribution in Australia, Sweden and New Zealand.” JPA 9(3): 205-232.

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