Caudill SB, JM Ford and DM Gropper (1995). “Frontier Estimation and Firm-Specific Inefficiency Measures in the Presence of Heteroscedasticity.” J Business and Economic Statistics 1: 105-111.

Caudill SB, JM Ford and DM Gropper (1995). “Frontier Estimation and Firm-Specific Inefficiency Measures in the Presence of Heteroscedasticity.” J Business and Economic Statistics 1: 105-111.

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