F?re R and S Grosskopf (1994). “Estimation of Returns to Scale Using Data Envelopment Analysis: A Comment. Scandinavian J Economics.” Scandinavian J Economics 7: 379-382.

F?re R and S Grosskopf (1994). “Estimation of Returns to Scale Using Data Envelopment Analysis: A Comment. Scandinavian J Economics.” Scandinavian J Economics 7: 379-382.

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