F?re R and S Grosskopf (1995). “Nonparametric-Tests of Regularity, Farrell Efficiency, and Goodness- of-Fit.” J Econometrics 6: 415-425.

F?re R and S Grosskopf (1995). “Nonparametric-Tests of Regularity, Farrell Efficiency, and Goodness- of-Fit.” J Econometrics 6: 415-425.

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