Forrsund FR, P Schmidt and CAK Lovell (1980). “A Survey of Frontier Production Functions and of Their Relationship to Efficiency Measurement.” J Econometrics 13: 5-25.

Forrsund FR, P Schmidt and CAK Lovell (1980). “A Survey of Frontier Production Functions and of Their Relationship to Efficiency Measurement.” J Econometrics 13: 5-25.

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