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.